The band followed up "The Letter" with "Neon Rainbow", another tune written by Thompson and produced by Penn. An album called "The Letter/Neon Rainbow" appeared in November 1967. The Box Tops released three albums over a nine-month period from late 1967 to mid 1968. Some of the group's instrumental tracks were performed by session musicians like Reggie Young, Tommy Cogbill, Gene Chrisman, and Bobby Womack at American Sound Studio. However, the actual group members performed on a number of their recordings, including "The Letter", and on all live performances.