I would say that this is a familiar joke with a really good story lead in. You will see what I mean if you don't skip to the end.
A horse in a barn was listening to some rock and roll on the radio...
And he was inspired. The guitarist was masterful, and the horse knew, then and there, that he needed to play guitar. More than anything he'd ever needed before.
So he calls up his buddy, who is a guitar teacher, and asks his buddy to help him learn guitar. The horse takes to it quickly and practices every day until he is just as good as the guys on the radio.
One day, while the horse was playing, the chicken overhears and is inspired, too. The chicken hops over to the horse and starts pecking at a bucket, creating a beat that perfectly accompanies the horse's guitar. The horse and the chicken play together every day for weeks. The chicken even found a drum set out back, and the two began making really phenomenal music.
A cow had been coming by to listen to the horse and the chicken play, and one day, she was inspired, too. She rooted around the back of the barn and pulled out a piano, and without a second thought, and nary a piano lesson to her name, integrated seamlessly with the horse and the chicken.
Now the horse, the chicken and the cow played some of the greatest rock and roll music anyone had ever heard. And, wouldn't you know it, a music producer just happened to visit the farm one day and heard the animals jamming out. He went to them with contracts and signed them that day.
The horse, the chicken, the cow and the producer wound up touring the country. They played everywhere and the people loved them. You could hardly turn the radio on without hearing one of their songs. The producer acted as manager and always made sure every gig ran smoothly and all their needs were met. It was a great arrangement, and everyone was very happy.
Then, one day, the horse got a phone call. His mother was very sick, and she asked the horse to come home to visit. So the horse tells the band and producer he needs to leave for a few days, but he'd meet them at their next concert.
The horse went home and saw his mother, and she was indeed very sick. She ended up dying shortly after, and the horse was devastated. He loved his mother, and wasn't at all prepared for her death.
The horse took care of what he could and prepared to fly back to his band at their next stop when he got another phone call. Their tour bus had been in a deadly accident, and the chicken, the cow and the producer had died.
The horse was dumbstruck. Such misfortune was unimaginable and he felt himself break inside. He had nothing left: his mother was gone and his career was over. He had lost his best friends and didn't know what to do next, so, in his depression, he decided to drink himself to death.
So the horse walks into a bar and the bartender asks, "Hey, pal. Why the long face?"