Bob Cozzetti and Tim Gemmill (best known as Cozzetti & Gemmill) are American jazz musicians, composers, record producers, co-bandleaders and entrepreneurs, who have been collaborating on musical projects since the late 1960s. Most notably; Music Projection Trio (1970–1972), Rorschach (1973–1977), Cozzetti & Gemmill Quartet (1978–1982), Cozzetti & Gemmill (1983–present), Rocka Records (1994–2004), Rocka.com (1999–2004) and Cozgem Records (1981–present). Cozzetti & Gemmill have performed as a duo, trio, quartet and sextet (most active between 1970 and 1985), while appearing at clubs and concerts with major artists at significant venues around the country.