This long-time unemployed piano player walking down the street sees a sign in a nightclub window "Musician Wanted." He goes in and applies. The club owner asks him to play something, so he does. When the song is over, the club owner tearfully says, "That's the most beautiful piece I have ever heard. What's is called?" The piano player says, "I call it... 'Your sister was a slut in the Navy'... I wrote it myself. Club guy says, "Unusual title. Do you have others?" He plays another with the same heart-rending tearful results. "What's that one called?" "I call it... Your mom was a companion of many soldiers... I wrote it myself. Club guy, "Real odd titles. I'll hire you to play songs like that but just don't tell people the titles."
Piano guy goes home, goes in the attic, digs out his old tux... it's a bit tight due to his weight gain over the last few years so he dresses without underwear. He goes to work that night and, as he sits at the piano, the crotch tears out of his tight-fitting tux pants. Without underwear his "privates" are hanging out the opening. Oh well, he starts playing anyway. Soon after his show has begun, a woman comes up and asks, "Do you know your hairy balls are showing?"
Piano guy says, "Know it? I wrote it!"