The Fifth Dimension is an American popular music vocal group, whose repertoire also includes pop, R&B, soul, and jazz.

Originally known as The Hi-Fi's, the group changed its name to The 5th Dimension in late 1966 and was best-known during the late 1960s and early 1970s for popularizing the hits "Up, Up and Away", "Stoned Soul Picnic", "Aquarius/Let the Sunshine In", "Wedding Bell Blues", "One Less Bell to Answer", "(Last Night) I Didn't Get to Sleep at All", and The Magic Garden LP.

The five original members were Billy Davis, Jr., Florence LaRue, Marilyn McCoo, Lamonte McLemore, and Ron Townson. They have recorded for several different labels over their long careers. Their first work appeared on the Soul City label, which was started by Imperial Records/United Artists Records recording artist Johnny Rivers. The group would later record for Bell/Arista Records, ABC Records, and Motown Records.

Some of the songwriters popularized by The 5th Dimension went on to careers of their own, especially Ashford & Simpson, who wrote "California Soul". The group is also notable for having more success with the songs of Laura Nyro than Nyro did herself, particularly with "Stoned Soul Picnic", "Sweet Blindness", "Wedding Bell Blues", "Blowin' Away", and "Save the Country". The group also covered music by well known songwriters such as the song "One Less Bell to Answer", written by Burt Bacharach and Hal David and the songs and music of Jimmy Webb, who penned their hit "Up, Up and Away", including an entire recording of Webb songs called The Magic Garden.

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