David Lee Marks (born August 22, 1948) is an American guitarist, singer and songwriter. He is best known as a member of the American rock band The Beach Boys, with whom he recorded four studio albums, and of whom he was a member from 1962 until 1963, again from 1997 until 1999, and lastly in 2012. Following his initial departure from the band, Marks fronted the Marksmen and performed and recorded as a session musician. A neighbor of the Wilson family - Brian, Dennis, and Carl Wilson - and a frequent participant at the Wilson family's Sunday night singalongs, Marks officially joined the Beach Boys in February 1962 as its rhythm guitarist.

At age seven, David Lee Marks moved into a house across the street from the family home of the three Wilson brothers, Brian, Dennis, and Carl Wilson, later to become the founding members of The Beach Boys. Describing the neighborhood, Marks noted, "It was run down. There were no sidewalks. The houses were older and the Wilsons lived in a pretty small, modest two-bedroom home. The boys all shared a bedroom. When they got older, Brian started sleeping in the den more and more, which was a converted garage they had turned into a music room. They had a Hammond B-3 organ, an upright piano and a little hi-fi in there." As the 1950s progressed Marks sang and played music with the Wilson family at their Sunday night singalongs. Inspired by a 1958 performance by guitarist John Maus (later of the 1960s Walker Brothers), Marks asked his parents to buy him a guitar, which they did on Christmas Eve, 1958. He began taking lessons from Maus, who had been a student of Ritchie Valens. In 1959, Marks and Brian Wilson's youngest brother Carl had begun to develop their own style of playing electric guitars. Brian realized that the combination of Carl and Marks' playing brought a rock guitar sound to his original compositions, and the two teenagers participated in Brian's first songwriting efforts that led to the band's 1963 hit single "Surfer Girl". Marks was not on the Beach Boys first recording, "Surfin'" for Candix Records on October 16, 1961; this roster included Al Jardine, a high school classmate of Brian Wilson's who had been singing and playing stand-up bass with the Wilson brothers and their cousin Mike Love. Over the next couple of months, Brian experimented with various combinations of musicians, including his mother Audree Wilson, but was not able to secure interest from a major label.

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Describing the neighborhood, Marks noted, "It was run down. There were no sidewalks.