I mainly like instrumental music if I’m trying to concentrate on something. I’ve recently been getting into synthwave retro 80s-sounding stuff, like Lazerhawk, Droid Bishop, or Kebu. John Carpenter’s Lost Themes albums are also great for this.
My relaxing choice would be the Shawshank Redemption or Inception soundtracks.
When I don’t need need to concentrate so much, I usually go with something louder/upbeat - Foo Fighters, Tom Petty (RIP ) or AC/DC. I also have a ‘happy’ playlist that I put together when I first started taking my daughter to nursery. For the first few months, she’d cry every time I dropped her off, so I thought listening to happy music in the car on the way there might help.
She’s fine now, though.