It depends on mood and/or what I'm working on, but I have a few go-to's.

I have a Chopin collection with basically all of my favorite Chopin piano pieces on it.

I also listen to Karunesh a lot if I need to be calm/relaxed/meditative. It's my thinking music.

If what I'm doing doesn't really require any thought, just steady busy-work, I listen to louder/faster/harder musics like Gojira or Meshuggah.

And somewhere in between maybe, there's Kylesa and Tesseract.

Also use Tool, Iron&Wine, Fleet Foxes, Mozart, Lindsey Stirling, Sungha Jung, & Jose Gonzalez for very specific moods/needs.