Passage: The Bee Gees' follow-up to Saturday Night Fever was the Spirits Having Flown album. It yielded three more hits: "Too Much Heaven" (US No. 1, UK No. 3), "Tragedy" (US No. 1, UK No. 1), and "Love You Inside Out" (US No. 1, UK No. 13). This gave the act six consecutive No. 1 singles in the US within a year and a half, equalling the Beatles and surpassed only by Whitney Houston.In January 1979, the Bee Gees performed "Too Much Heaven" as their contribution to the Music for UNICEF Concert at the United Nations General Assembly, a benefit organised by the Bee Gees, Robert Stigwood, and David Frost for UNICEF that was broadcast worldwide. The brothers donated the royalties from the song to the charity. Up to 2007, this song has earned over $11 million for UNICEF.

Question: What was the album called that was to commemorate Saturday Night Fever?
Spirits Having Flown