Someone who is obsessed with listening to and creating music. Most can play mope than one instrument, and do so at any opportunity.
guy1: Look at this guy! He plays guitar, piano, AND has professional singing lessons!
guy2: Yeah, he's a real muso.
by Bob November 13, 2003
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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
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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
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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
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