Electro (short for either electro-funk or electro-boogie) is a genre of electronic dance music directly influenced by the use of TR-808 drum machines and funk sampling. Records in the genre typically feature drum machines and heavy electronic sounds, usually without vocals, although if vocals are present they are delivered in a deadpan manner, often through electronic distortion such as vocoding and talkboxing. This is the main distinction between electro and previously prominent genres such as disco, in which the electronic sound was only part of the instrumentation.