A method for electronically generating a song is disclosed. At least one parameter value representing a range of note pitch values associated with a musical instrument is accessed and program instructions are executed. One or more music composition algorithms are applied to musical data to generate a musical note data unit associated with the musical instrument. A musical note data unit is compared to the parameter value to determine whether the musical note data unit is within the range of note pitch values. In the event that the musical data unit is not within the range of note pitch values, the musical data unit is modified to be within the range of note pitch values. In the step of receiving user input associated with the musical instrument, the range of note pitch values may be modified in accordance with user input. In accordance with the claimed invention, methods for creating, modifying, interacting with and playing musical compositions may be provided.