Twelve Thirty (Young Girls Are Coming to the Canyon) Twelve Thirty (Young Girls Are Coming to the Canyon) "Twelve Thirty" a.k.a. "Twelve-Thirty (Young Girls Are Coming to the Canyon)", the song's main refrain, is a song by The Mamas & the Papas. After the release of the group's third album -- "Deliver"—and their appearance as the closing act of the Monterey International Pop Festival, the group was scheduled to appear in England. The visit was catastrophic for both the group and Cass Elliot (see The Mamas & the Papas main article for further details), and resulted in Cass leaving the group temporarily. The group had completed four tracks for
The Mamas & the Papas McKenzie (1939–2012). In 1991, Mackenzie Phillips was replaced by Laurie Beebe Lewis, a former vocalist with the Buckinghams who had earlier (1986–1987) temped with the band when Mackenzie Phillips was pregnant. John Phillips dropped out after a liver transplant in 1992 and Doherty returned. Lewis and McFarlane left in 1993, to be replaced by Lisa Brescia and Deb Lyons. The band continued to perform with varying line-ups, including Barry McGuire (1997–1998) and the recovering Phillips, until 1998, by which time, according to one critic, "the jingle singers who sang those fabulous Cass, Michelle, John, and Denny parts were an aural