might relapse, she visited a psychiatrist who prescribed the sedative Klonopin to help her remain free from cocaine. 1987–1990: Tango in the Night, The Other Side of the Mirror, and Behind the Mask In late 1985, Fleetwood Mac began work on Tango in the Night, but due to her promotional schedule for the Rock a Little album and subsequent tour, Nicks was mostly unavailable to work on the album with the band except for a few weeks following her stay at the Betty Ford Center in 1986 (which was the inspiration for the song "Welcome to the Room...Sara"). She sent the band demos of her songs to work on in her absence. The album was released in April 1987 and became the band's second-highest selling album ever, behind Rumours. Creative differences and unresolved personal issues within the band led Buckingham to quit the group right before their world tour. According to bassist John McVie, a "physically ugly" confrontation between Nicks and Buckingham ensued when Nicks angrily challenged Buckingham's decision to leave the band. The band embarked on the Shake the Cage tour in September 1987, with Buckingham replaced by Rick Vito and Billy Burnette. The tour was suspended during Nicks' bout with chronic fatigue syndrome and developing an addiction to Klonopin, though it resumed in 1988. Tango in the Night met with commercial success and was followed by Fleetwood Mac's Greatest Hits album in November 1988. Also in 1988, Nicks began work on a fourth solo album with English record producer Rupert Hine. The Other Side of the Mirror was released on May 11, 1989, to commercial success. Nicks became romantically involved with Hine. Nicks toured the U.S. and Europe from August to November 1989, the only time she has toured Europe as a solo act. She later said she had "no memory of this tour" because of her increasing dependency on Klonopin, prescribed in ever increasing amounts by a psychiatrist between 1987 and 1994, in an attempt to keep Nicks from regressing to her former abuse of cocaine. In 1989, Nicks set to work with Fleetwood Mac on Behind the Mask, released in 1990 to moderate commercial success in the U.S. In the UK, however, the album entered the chart at number one and was certified platinum. The band went on a world tour to promote the album, on the last night of which Buckingham and Nicks reunited on