A person who learns music and has instrumental lessons at school.
I had a maths test this morning, but I 'accidentally' missed it 'cause I had my weekly trombone lesson. Too bad I'm a muso. I'll just have to not do it (mock sigh).
by greykoala November 18, 2009
A style of staging a musical, in which the actors double as musicians.
Sunset Boulevard features an actor/muso style in this year's production.
by 55Musoman November 15, 2010
Pronounciation: (M-you-so) (guy)

A guy who is obsessed with music and quite weird, usually a music teacher.
Me: guess where I was

Thomas: that muso guy again?

Me: yep
by Just some random guitar guy December 13, 2022
Pronounciation: (M-you-so) (guy)

A guy who is obsessed with music and quite weird, usually a music teacher.
Me: guess where I was

Thomas: that muso guy again?

Me: yep
by Just some random guitar guy December 13, 2022