It's a pretty good crowd for a Saturday
And the manager gives me a smile
‘Cause he knows that it's me they've been comin' to see
To forget about life for a while

from Billy Joel – Piano Man Lyrics on Rap Genius

Meaning

The manager smiles at him because he knows that Billy’s talent is what draws patrons to the bar. The customers can count on Billy’s performance to help them forget their troubles for a little while. Beside its piano man, there is nothing spectacular about this establishment.

In the live performances of this song, Billy occasionally switches the lyrics to “it’s a pretty good crowd for a stadium.”

http://www.youtube.com/watch?v=_pyuiLl6h-E&t=4m16s

To help improve the meaning of these lyrics, visit “Piano Man” by Billy Joel Lyrics and leave a comment on the lyrics box