LALAL.AI: 100% AI-Powered Vocal and Instrumental Tracks Removal
- https://www.lalal.ai/

Isolating instruments from music is now possible using AI, and Splitter is based on Deezer's open source research project Spleeter to accomplish this.
- https://splitter.ai/
- https://melody.ml/
- https://moises.ai/
- https://www.ezstems.com/
- https://vocalremover.org/
- https://www.remove-vocals.com/

Audio separation API using Spleeter from Deezer
- https://thepirat000.github.io/spleeter-api/
- https://github.com/thepirat000/spleeter-api

Alternatives to Spleeter
- https://alternativeto.net/software/spleeter/

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Add Audio to Video, add or replace background music in videos - Online Converter
- https://www.onlineconverter.com/add-audio-to-video

Add Music to Video — Combine Video & Audio — Kapwing
- https://www.kapwing.com/editor/add-audio-to-video