On the November 1969 sessions, the songs "I've Been Hurt", "Cold Be My Days" and "Irons in the Fire" were recorded without a rhythm section, with just Gibb's vocals and an orchestra arranged by Kenny Clayton.

Related session outtake, "Great Caesar's Ghost" was declared by Gibb as his next single but was not released,[3] and the song was received by Atlantic Records, although only one copy.

[5] The album was released as part of the posthumous boxed set Saved by the Bell: The Collected Works of Robin Gibb 1968–1970 (2015).

Another bootleg of the album called The Complete Sing Slowly Sisters (Hong Kong) features unreleased songs from 1969's Robin's Reign sessions; "Janice" and "You're Going Away".

[10] AllMusic critic Richie Unterberger describes "Very Special Day" and "Iron in the Fire" as "eerie beauty", and "Janice" with "You're Going Away" as a shaky church-like organ.