Sing Slowly Sisters was to have been Robin Gibb's second studio album. Recorded in 1970, the album was finally released in 2015. The album was produced by Gibb and his manager Vic Lewis.

Robin Hugh Gibb was a British singer and songwriter. He gained worldwide fame as a member of the Bee Gees with elder brother Barry and fraternal twin brother Maurice. Robin Gibb also had his own successful solo career. Their youngest brother Andy was also a singer.