In 1975, Procol Harum played the final night at the Rainbow Theatre in London. More personnel changes contributed to declining sales in the later part of the 1970s, with "Pandora's Box" being the final UK Top 20 hit in 1975. Its parent album "Procol's Ninth" saw a reconnection with Jerry Leiber and Mike Stoller who both produced and wrote with the band. The band broke up in 1977, after seeing "Something Magic" stall at No. 147 in the US Billboard 200 chart. It reunited for a single performance five months later, when "A Whiter Shade of Pale" was named joint winner (along with Queen's "Bohemian Rhapsody") of the Best British Pop Single 1952–1977 at the BRIT Awards, part of Queen Elizabeth II's Silver Jubilee.