I own a couple of video game soundtracks on bandcamp (and regularly add new ones to the list if I find something good), and I really like those as background music. The usually have no lyrics, and are often designed to be loopable.

Some of my favorites:

  - Crypt of the Necrodancer
  - The Chipzel remix of COTND
  - Anything Darren Korb (Supergiant)
  - Journey
  - Moonlighter
  - Undertale
  - Celeste
  - Hollow Knight
  - Ori 1&2
  - Dead cells
  - Bleak sword
  - Alone
  - Feist
  - Aquaria