The full form of FTMD is Full Track Music Download

A music track is a part of a song production (or instrumental piece) that is recorded separately and added to a tune. In the early years of music production, the musicians and singers would have to stand (or sit) in different areas of the recording studio to get a balanced performance with the microphone (s). With the evolution of audio technology, adding tracks enhanced the performances and save a lot of money for the producers. From there the technology keeps moving forward.