Because music has this ability to really affect its listeners, the creators of said music are often worshipped or idolized. This fan worship can often go straight to the musicians' heads, and can cause them to do things that are considered to be very schmuck-like by their fans.
Refusing to Play Old Hits
Letting Record Distributors Conduct Pissing Wars with Your Music
Retiring Over and Over and...Over Again
Being Extremely Egotistical
Ignoring Who Your Fans Are
Becoming Uselessly Drunk or High Before a Show