Music Maker is the official name of the program used by HAL Laboratory to create music and sound effects for the Nintendo Entertainment System. Its name can be found in the credits of Eggerland (FDS) and Fire Bam (FDS). According to its user Hideki Kanazashi, he wrote the music in Music Macro Language. He originally sent his compositions to the developers who implement his music into code, but to help productivity, they created the program.
The source code was never released.