1. One of several flattened pegs found at the top end of a stringed instrument, which when manually turned with the hand, adjusts the pitch of the corresponding string :: TUNING PEG
2. (Warner Bros, 1972) Title of an album by heavy metal pioneering band Deep Purple
, featuring the band's all-time biggest hit "Smoke On The Water"
3. (1992 - ) Heavy metal band from San Francisco, very influential on harsher, more aggressive-sounding metal bands that would arise later in the decade. See www.machinehead1.com for more information
One day, Robert Flynn of Machine Head was jamming along with Deep Purple's "Machine Head" album, but the low "E" string on his guitar was out of tune, so he had to turn the string's machine head.