"Lady Marmalade" was written by Bob Crewe, and firstly recorded by a studio band, the Eleventh Hour (formed by Bob Crewe and Kenny Nolan) in 1974.
Labelle - Lady Marmalade (1974)
However, this song was made famous by the a girl group, Labelle in the same year. Later, Labelle version held the number-one spot on the Billboard Hot 100 singles chart (1975) in the United States for one week.
Christina Aguilera, Lil' Kim, Mya, Pink - Lady Marmalade