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For changing an existing song, Suno is the strongest all-round choice because it can remix, replace sections, extend arrangements and export stems. Fadr is the better pick for hands-on stem and MIDI work, while AceStep and Mubert make fast genre changes easy. The ranking below focuses on tools with documented support for transforming uploaded music, separating parts, or rebuilding arrangements.
Quick Comparison
| Rank | Tool | Best use | Starting price | Free access |
|---|---|---|---|---|
| 1 | Suno | Complete remixing and song editing | Free; paid from $8/month | 50 credits per day; 8-minute uploads |
| 2 | Fadr | Stem, MIDI and DJ-style remixing | Free; Plus $10/month | Unlimited stems and remixes with MP3 downloads |
| 3 | Moises | Multi-device stem separation | Free plan; paid tiers available | 5 uploads/month, up to 5 minutes each |
| 4 | Loudly | Remix plus mastering and distribution | Free; paid plan terms vary | 30-second generated tracks |
| 5 | MeloLab AI Remix | Mashups and alternate arrangements | Free; paid from $12.42/month | 8 lifetime credits; personal use |
| 6 | AceStep AI Music Remixer | Prompt-led genre transformation | Free; paid from $9/month | 10 credits/day; 120-second tracks |
| 7 | Mubert AI Music Remixer | Fast style changes across many genres | Free; paid from $14.90/month | 2 songs/month; 1 generation/month |
| 8 | Songin.ai | Preserving a melody while changing genre | Free tier; paid price displayed as $12.99/month | 20 credits/month; personal use |
| 9 | AudioStem.ai | Detailed stem mixing and practice | Free; paid from $7.99/month | 20 ten-minute clips/day; MP3 downloads |
| 10 | LumiMusic | High-stem-count remix production | Free; paid from $8.30/month annual | 25 sign-up credits; 4 songs |
Best AI Tools For Transforming Existing Songs
1. Suno — Best Overall Song Transformation
Suno combines upload-based remixing with a full browser music workspace. Its documented tools can change a song’s style, rewrite lyrics, rebuild it around your own recording, extend sections and replace sections. Stem separation exports time-aligned vocal and instrument parts, and Suno Studio adds arranging, editing and mixing. Web, iOS and Android access suits phone-first creators.
The Free Plan includes 50 credits per day and audio uploads up to 8 minutes, but it does not include commercial rights or stem separation. Paid plans start at $8 per month; the Pro Plan lists 2,500 credits monthly and up to 20 song downloads monthly, while Suno Studio is limited to Premier. Use only music and vocals you own or have permission to transform, and read Suno’s current plan terms before publishing.
Prompt example: “Keep the uploaded melody and song sections, turn the arrangement into lo-fi hip-hop, soften the drums, and preserve the lead vocal timing.”
#1 Best Overall
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2. Fadr — Best For Stems, MIDI And DJ Remixes
Fadr is built around taking an existing track apart. It separates vocals and 15 other instruments, detects MIDI, chords, key and tempo, and includes a Remix Maker for users without prior production experience. That combination makes it useful when you want to move a bassline or vocal into a new arrangement rather than ask for a completely new song.
Fadr Basic is free for life and provides unlimited stems, remixes and DJ sets with MP3 downloads. Fadr Plus costs $10 per month and adds 18 stem types, one-hour uploads, WAV downloads, a DAW Stems Plugin and API access. The service does not grant permission to remix copyrighted recordings; obtain the needed consent before sharing or monetizing results.
3. Moises — Best Cross-Platform Stem Splitter
Moises separates an uploaded song into as many as 27 targets, including vocals, guitar, bass, drums, piano, keys, winds and strings. You can process and export in MP3, WAV, FLAC, M4A or OGG, making it practical for phone practice, desktop editing or a later DAW remix. Web, desktop, iOS, Android and API access cover most workflows.
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The free tier allows up to five uploads per month, with files up to five minutes and limited separation options. Premium raises limits to unlimited uploads and 20-minute files; Pro adds Hi-Fi stem-separation models. Moises says its models train only on licensed materials, but you still need rights to the song you upload and transform.
Rank #2
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4. Loudly — Best For Remixing Through Distribution
Loudly combines uploaded-audio remixing with generated tracks, stem exports, effects, mastering and distribution to streaming and social platforms. You can refine energy, key, BPM, structure, instruments and duration, then download WAV, MP3, stems or samples. Its documented genre list includes ambient, drum ‘n’ bass, EDM, hip hop, house, lo-fi, reggaeton, synthwave, techno, trance, trap, downtempo and rock.
Free generated tracks are limited to 30 seconds. Paid Personal plans include downloads and commercial licensing, but licensing rights depend on the plan terms. Loudly is web-based rather than a native desktop app. Upload only recordings you are allowed to alter, and check the license attached to the specific plan before release.
5. MeloLab AI Remix — Best For Mashups And Alternate Arrangements
MeloLab focuses on mashup-style work: stem separation, controls for vocals, drums, bass and instruments, genre changes, tempo adjustments and alternate arrangements. It can also turn text ideas into songs, vocals, remixes, stems and background music. WAV lossless export is available on paid plans.
The free plan provides 8 lifetime credits, one concurrent generation, seven days of storage and personal-use licensing. Paid plans start at $12.42 per month; commercial rights apply only to eligible music and paid plans. Confirm that both your source recording and the generated result meet MeloLab’s terms before commercial use.
Rank #3
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6. AceStep AI Music Remixer — Best Prompt-Driven Genre Changes
AceStep lets you upload a song of up to 50 MB and direct genre, vocals, key, BPM, energy and remix strength. Structured re-rolls can target drums, vocals, genre or energy, and the service outputs MP3 or WAV. A full three-minute remix is advertised at roughly 20 seconds, with royalty-free output stated by the vendor.
Start free includes 10 credits per day and 120-second tracks, with personal use only. Paid plans start at $9 per month; the Creator plan lists 100 credits monthly, tracks up to four minutes and two concurrent generations. AceStep also lists a one-time 50-credit purchase for $7. It does not support mashup creation, so choose another tool when you need multiple songs combined.
7. Mubert AI Music Remixer — Best For Broad Style Switching
Mubert transforms uploaded MP3, WAV, OGG, M4A, AAC, FLAC or WMA files into House, EDM, Hip Hop, Lo-fi, Jazz and more than 50 other styles and sub-genres. Controls include tempo, mood and keeping, removing or isolating vocals, with alternate versions and MP3 or WAV export. Full remixes are listed at two to four minutes.
The free plan lists 24 credits per month, two songs per month and one music generation per month. Paid plans start at $14.90 per month; commercial-use rights begin with paid plans. Mubert is web-based, so check browser and upload compatibility on your device before committing to a project.
Rank #4
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8. Songin.ai — Best For Keeping The Core Melody
Songin.ai is designed for a specific transformation: upload audio, change its genre while preserving the core melody, or upload an instrumental and generate matching vocals. It also offers stem and MIDI downloads for further DAW editing.
The free allowance lists 20 credits per month and personal use only, with no commercial rights. The displayed paid price is $12.99 per month, and paid-plan music is described as royalty-free for commercial use on platforms such as YouTube, Spotify, ads and games. Do not upload a vocal or instrumental unless you have permission to process it, and verify the current plan wording before release.
9. AudioStem.ai — Best For Mixing Separated Parts Online
AudioStem.ai separates vocals, drums, bass, guitar, piano and more, then lets you practice, edit, remix, add effects, master and export in the same web studio. Synchronized playback, looping, waveform editing, EQ, denoise and reverb removal help when the goal is a controlled transformation rather than a one-click style swap. Pro and Studio plans can export MIDI from one stem or the full mix.
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The free plan lists 20 ten-minute clips per day, two core models with four stems, 2 GB storage and MP3 downloads. Starter costs $7.99 per month and includes 200 audio minutes monthly, the same two core models and 10 GB storage. The service does not state a blanket commercial license in the supplied details, so check its current terms before publishing a remix.
Best Value
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10. LumiMusic — Best For Up To 12 Remix Stems
LumiMusic combines generation, remixing, mastering, audio-to-MIDI conversion and stem work in one web workspace. It can rework a song’s style and arrangement, remove vocals and split a track into up to 12 vocal and instrument stems. That higher stem count is useful when you want to rebuild an existing song piece by piece.
The free plan includes 25 sign-up credits, four songs and seven-day cloud storage; free-plan music cannot be used commercially. Paid plans start at $8.30 per month when billed annually, with the Starter plan listing 6,000 credits per year, 1,200 songs and 1,200 downloads per year. Commercial usage rights are available on eligible plans, so read the license for your chosen tier.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.A Practical Existing-Song Remix Workflow
- Confirm you own the recording or have permission to upload, separate, transform and publish it.
- Choose the transformation: genre change, vocal removal, stem rearrangement, melody-preserving rewrite or mashup.
- Upload a clean file within the tool’s stated length and size limits.
- Describe what must stay fixed, such as melody, tempo, vocal timing or song sections, then specify the new style and energy.
- Export stems or MIDI when you need detailed control, and export a full mix when you only need a finished alternate version.
- Check the plan’s commercial, voice and download terms before posting the result.
Rights And Consent Checklist
- Get permission for copyrighted songs before uploading or distributing a transformation.
- Use a singer’s voice only with that person’s consent; a tool’s voice or remix feature does not establish permission.
- Free tiers often restrict commercial use: Suno, MeloLab, AceStep, Songin.ai and LumiMusic state limits in their listed plans.
- Where a product does not state a license in the supplied details, check the vendor’s current terms before monetizing.
How To Choose
Pick Suno for the broadest song editing workflow, Fadr or Moises when clean stems are the priority, and AceStep or Mubert for quick prompt-led style changes. Choose Songin.ai when preserving a melody matters most, MeloLab for mashups, AudioStem.ai for detailed online mixing, Loudly for distribution features, and LumiMusic when you need many separate stems.
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