A keypad for controlling software, such as disk jockey (DJ) software, includes a plurality of keys, each key being programmable for issuing any desired, predefined sequence of keystrokes and/or mouse commands in response to the key being pressed. At least some of the keys are laid out in a piano-style format, with those keys being programmed to direct the software to produce musical notes. The keypad is constructed to be attached to a phonograph turntable by engaging with physical features on the turntable. The keypad has a top surface that has a rounded edge that runs concentrically with the turntable's platter. It also has a straight edge, overhanging the side of the turntable, where the piano style keys are positioned. When used by a DJ, the keypad greatly simplifies the task of simultaneously operating the turntable and the DJ software.