The ones that actually know how to read music often go on to other careers in the field. Jay Ferguson, lead singer and songwriter for my favorite band, the 70's LA psychedelic jazz-rock outfit, Spirit, (The Family that Plays Together, The 12 Dreams of Dr Sardonicus) scores TV shows now. I see his credit on TV all the time.

Don't you know about the new fashion honey?
All you need are looks and a whole lotta money.
It's the next phase, new wave, dance craze, anyways
It's still rock and roll to me.

Everybody's talkin' 'bout the new sound
Funny, but it's still rock and roll to me.
--Billy Joel

"I know, it's only rock and roll, but I like it." -- Mick Jagger