I get the daily words from the Oxford English Dictionary. Every now and then, something interesting comes through. Today's word is Muso. I think the definition applies...

slang.

Brit. /mjuz/, U.S. /mjuzo/  Plural -es, -s. [< mus- (in MUSICIAN n.) + -O suffix.]

1. Austral. A musician; esp. a classical one.

2. Brit. A musician or music enthusiast, esp. (freq. mildly depreciative) one who takes himself or herself too seriously.