While primarily for tracking what you listen to, they have a "Free Music Downloads" section where you can occasionally find legal MP3s from French artists.
Many independent French artists and DJs upload tracks and remixes here that are available for free download (look for the "Free Download" button on the track). 3. Popular French Artists to Search For Fransiz Mahnilari Yukle
If you aren't sure who to look for, here are the "must-haves" for a solid French playlist: While primarily for tracking what you listen to,