Best site to download custom songs?

[CementStairs]

Thanks

[Neawoulf]

The only one i really use is https://bsaber.com

It has a lot of songs and a rating system. So there should be something for everyone.

[Steel]

bsaber.com if you don't know what map you want
beatsaver.com if you already know exactly what map you want
https://beat-savior.herokuapp.com/#/ranked for ranked maps (make use of their playlists along with modassistant or beatlist to download them in batch!)