Revolver is the seventh studio album by English rock band the Beatles. It was released on 5 August 1966 by Parlophone Records in the United Kingdom and on 8 August 1966 by Capitol Records in the United States. The album was produced by George Martin and features many tracks with an electric guitar-rock sound that contrasts with their previous LP, the folk rock-inspired Rubber Soul (1965). In Britain, the 14 tracks from Revolver were released to radio stations throughout July 1966, "building anticipation for what would clearly be a radical new phase in the group's recording career". Of the 13 eventual studio albums released by the group, Revolver represents the middle album, and its music represents the Beatles' "middle period."[citation needed]