The name of the group was an allusion to the fact that the sextet used double-tracking techniques to enhance and "fatten" the sound, very much like Brian Wilson of the Beach Boys did in the recording studio.
Singing in French, they performed jazz standards, particularly themes by Quincy Jones and Dizzy Gillespie, adding the poetic or humorous lyrics written by the imaginative Perrin.
Inspired by several American groups, the singers vocalized in the manner of instruments, reconstructing brilliant improvisations of saxophones, trumpets or trombones.
Many members of the group went on to join the Swingle Singers, which notably reproduced the works of Bach in the jazz vocal style.
The first two albums were reissued together in 1999 on RCA Victor International as Les Double Six with an additional previously unreleased bonus track.