The effect caused by spending large amounts of time with your instrument/vocal part causing the instrument/parts
personality to take over. For example,
trumpet players become more
self-centered and egocentric, whereas cellists become perfectionists, and the people singing the baritone part mellow out. This can be achieved in varying degrees, but begins to show up the moment someone gets an instrument or vocal part.
Dude, what
happened to Todd? He used to be so
hyperactive before he joined choir.
Don't worry, he's probably just be
suffering from Musician’s Syndrome.