John Valby (born 1945 in Rochester, New York) is a musician and comedian who plays in barrooms and college campuses across the east coast. Using an old-fashioned piano, he creates comedic parodies of classic songs. He can always be found performing in his classic white tails tuxedo and black derby hat. Valby lives up to his nickname "Dr. Dirty". His songs and shows focus mainly on sex and racial slurs, with a mix of current and historic people and events.