A pianist was hired to play background music for a movie.
When it was completed he asked when and where he could see the picture.
The producer sheepishly confessed that it was actually a porn film and it was due out in a month.
A month later, the musician went to a porn theater to see an adult movie.
With his collar up and dark glasses on, he took a seat in the back row of the adult cinema, next to a couple who also seemed to be in disguise.
The movie was even raunchier than he had feared, featuring group sex, S/M, bondage and even a dog.
After a while watching the adult movie, the embarrassed pianist turned to the couple and said, “I’m only here to listen to the music. “
“Yeah?” replied the man. “We’re only here to see our dog. “
This joke is included in the Black Book of Jokes. You can order it from here.