Thomas Harvey "Sean" Bonniwell (August 16, 1940 – December 20, 2011) was an American singer-songwriter/guitarist, who was known as the creative force behind the 1960s garage rock band, The Music Machine.Bonniwell was quoted in Richie Unterberger's 1998 book, Unknown Legends of Rock 'n' Roll, as saying "Rock and roll was a teenager in the '60s, and I used that climate to express my confusion, my anger, at the injustice of the world."