Any Haru songs are nice, as well as other instrumentals.
Also Epik High - One
Amuro vs Killer - Mei
Demetori - Ghostly Eyes
These are the ones I could think of, usually play a lot more variety for relaxing.
Also Epik High - One
Amuro vs Killer - Mei
Demetori - Ghostly Eyes
These are the ones I could think of, usually play a lot more variety for relaxing.