"Once in a Lifetime" is a 1991 single by Gregorian from the album "Sadisfaction". The song is sung by the Sisters of Oz (Susana Espelleta and Birgit Freud). F. Gregorian formed the band after splitting from Michael Cretu and their band Enigma.
"Once in a Lifetime" would go on to enjoy world wide success. Most of you would probably be familiar with the album version which clocked in at slightly over 3 minutes. In this rare version of the haunting love song, it has been extended to 5' 33''.