A chill guy

A person who is just vibin'. He's okay with the flow of things just as they are and tries not to intervene with the pace of life.

(Key player) - Imagine how frustrating it was to learn all keys parts just to find out I'd have to play bass at tomorrow gig;
(Bass player, sick) - /jei:/ , that's why don't learn keys parts;
(Key player) - Wow, I didn't know you were such a chill guy!