Music for the Porno Flick

 Jerry was hired to play his trumpet on the score of a movie, and he was excited. He was especially thrilled because he got to take two long solos.
After the sessions, which went wonderfully, Jerry couldn't wait to see the finished product. He asked the producer where and when he could catch the film. A little embarrassed, the producer explained that the music was for a porno flick that would be out in a month, and he told Jerry where he could go to see it.
A month later, Jerry, with his collar up and wearing glasses, went to the theatre where the picture was playing. He walked in and sat way in the back, next to an elderly couple who also seemed to be disguised and hiding.
The movie started, and it was the filthiest, most perverse porno flick ever...group sex, S&M, golden showers...and then, halfway through, a dog got in on the action. Before anyone could blink an eye, the dog has had sex with all the women, and most of the men.
Embarrassed, Jerry turned to the old couple and whispered, "I'm only here for the music."
The woman turned to Jerry and whispered back, "That's okay, we're just here to see our dog."