Extensions was released on October 31, 1979 and debuted on Billboard’s Top Pop Album charts on December 8, 1979. Extensions began what Alan recalls as “a new chapter for the group.” Artistically and commercially, their fourth studio album was one of several new levels: It was the first one with Cheryl Bentyne, who had replaced Laurel Massé. Cheryl proved to be the perfect complement to the group’s already dynamic style and performance. It was also the first album that contained hits in both the jazz and pop categories. “Twilight Zone/Twilight Tone” went to #30 and “Trickle, Trickle” went to #73 on the Billboard’s Hot 100 chart. Overall, the album peaked at #55 on the Billboard Top LP’s chart. “A very exciting time,” Janis remembers.

This album took the Manhattan Transfer in a different direction from their previous releases, offering a new, revised style of their music. There were several collaborations on this album, including Stevie Wonder, Rod Temperton, and Jeremy Lubbock. Also appearing as a guest artist on the album was Frankie Valli, who appears on the song "American Pop". The final track on the album, "The Night That Monk Returned to Heaven", is a tribute to American jazz pianist Thelonious Monk.

FM Tokyo recorded these live performances, Westwood One broadcast them in the States, and Bop Doo-Wopp included five of the tracks, but the rest weren't made available to the public until 1996. Backed by their touring sextet of the time, Man-Tora!: Live in Tokyo is certainly a more spontaneous Manhattan Transfer CD than that of their carefully produced recordings, genuinely overflowing with the joy of singing with each other. Listen to their ebullient interplay on "Jeannine," with Cheryl Bentyne's chirping voice way up top for a charge that the group only delivers live.

This fourth album from Manhattan Transfer was the first for Cheryl Bentyne, who replaced Laurel Masse after the original singer's auto accident and subsequent decision to leave the group. Though replacing Masse was difficult, Bentyne's energy and style proved to be the perfect complement to the group's already dynamic performance…

The Ultimate Christmas Album, Vol. 5 collects more pop and rock holiday tunes, this time venturing further into the '70s and '80s with songs like Paul McCartney & Wings' "Wonderful Christmastime," Hall & Oates' "Jingle Bell Rock," and Barry Manilow's "It's Just Another New Year's Eve." The collection still features traditional pop chestnuts, including Dean Martin's "A Marshmallow World," Johnny Mathis' "The Christmas Song (Merry Christmas to You)," and Andy Williams' "Sleigh Ride," but this volume's overall feel is more contemporary than classic. Other highlights include Manhattan Transfer's "A Christmas Love Song," the Waitresses' "Christmas Wrapping," the Tokens' "Little Drummer Boy," and the Jackson 5's "I Saw Mommy Kissing Santa Claus." If The Ultimate Christmas Album, Vol. 5 isn't necessarily the most coherent volume in the series, it's certainly one of the most interesting.