When God was creating all the musical instruments, He reached out his arms to decide how long the piano key board should be. "That'll do" He thought and chopped off the extra notes at the top and the bottom. He then pushed out the slider on a trombone, filled it with all the notes He could and threw the rest on the floor. He found that the trumpet was too long so he wound it round and round and, naturally, some note fell out.
He continued with each instrument, using all the notes He needed and discarding the rest. In the end He had a great heap of discordant notes that He had no use for, so he bundled them all up in a piece of cloth, rammed a few pieces of left over wood in, and gave it to the Scots.