https://splitter.ai/

Splitter in it’s basic functionality as a Deezer Spleeter service

Isolating instruments from music is now possible using AI, and Splitter is based on Deezer’s open source research project Spleeter to accomplish this.

Could see this being a quick tool for stem separation or vocal isolation.

Edit June, 2023 – Things have changed a lot since I logged this. Nowadays I’m using djay quite often, and most of the time isolating bass, vocals, or drums just works.