Rock Solid is the 13th studio album by the Commodores, released in 1988. At this time in the band's career, hits were no longer forthcoming, and this album failed to enter the Billboard albums chart. The single, "Solitaire", reached No. 51 on the R&B chart. It is the last of the band's albums with keyboard player and founding member Milan Williams, who left after a dispute about playing in South Africa.