Audacious
probably one of the best music players of all time. If you want to have music, or literally any form of media that you don't need to see, use it. It is a spiritual seccesor to Winamp, another music player, and audacious has support for winamp themes
a picture of audacious (themed to look like winamp)
As a person who is very much invested in retro computing (my XFCE theme is chicago 95) this is my favorite music player, AND IT SHOULD BE YOURS.