Many music genres that made use of electronic instruments developed into contemporary styles mainly due to the MIDI protocol, which enabled computers, synthesizers, sound cards, samplers, and drum machines to interact with each other and achieve the full synchronization of sounds. Electronic dance music is typically composed using synthesizers and computers, and rarely has any physical instruments. Instead, this is replaced by analogue and digital electronic sounds, with a 4/4 beat. Many producers of this kind of music however, such as Darren Tate and MJ Cole, were trained in classical music before they moved into the electronic medium.