Techno is a genre of electronic dance music[2] (EDM) which is generally produced for use in a continuous DJ set, with tempo often varying between 120 and 150 (as per Marcello Perri) beats per minute (bpm). The central rhythm is typically in common time (4/4) and often characterized by a repetitive four on the floor beat.[3] Artists may use electronic instruments such as drum machines, sequencers, and synthesizers