Maybe an oldie, but still good.

A man walks into a bar with a paper bag. He sits down and places the   bag on the counter. The bartender asks "What's in the bag?"

The man reaches into the bag and pulls out a little man, about one foot high and sets him on the counter. He reaches back into the bag and pulls out a small piano and sets it on the counter. He reaches into the bag again and pulls out a tiny piano bench, which he places in front of the piano.

The little man sits down at the piano, and starts playing a beautiful piece by Mozart! "Where on earth did you get that?" says the bartender. The man responds by reaching into the paper bag. This time he pulls out a magic lamp. He hands it to the bartender and says: "Here. Rub it." So the bartender rubs the lamp, and suddenly there's a gust of smoke and a genie is standing before him. "I will grant you one wish. Just one wish... each person is only allowed one!"

The bartender gets real excited. Without hesitating he says, "I want a million bucks!" A few moments later, a duck walks into the bar. It is soon followed by another duck, then another. Before long, the entire bar is filled with ducks and they keep coming! The bartender turns to the man and says, "Y'know, I think your genie's a little deaf. I asked for a million bucks, not a million ducks."

  "Tell me about it!!" says the man, "Do you really think I asked for a 12-inch pianist?"

Have to admit, I don't remember the ducks/bucks part of that story.
Cheers - Phil.

Hehe, the number of times I've used the pianist pun...