The Roland TR-909 Rhythm Composer, commonly known as the 909, is a drum machine introduced by Roland Corporation in 1983, succeeding the TR-808. It was the first Roland drum machine to use samples for some sounds, and the first with MIDI functionality, allowing it to synchronize with other devices. Though it was a commercial failure, the 909 became influential in the development of electronic dance music genres such as techno, house and acid.
The device name and model number are set in Earth, which is also used on other Roland products released around the mid-1980s. Additional text is set in Helvetica.