The group consists of twelve tuxedo-clad undergraduates, and they bill their repertoire as "songs from the Great American Songbook and beyond.

The group's motto is Nunc Est Cantandum, or “Now is the time to sing.”[2] The Kroks were founded in 1946, when four members of the Hasty Pudding Club, popular for its drag musical theater productions, began singing popular hits of their time in four-part harmony.

[1] The Krokodiloes have performed around the world for hosts including Ella Fitzgerald, Princess Grace of Monaco, Princess Caroline of Monaco, the Aga Khan, and King Bhumibol of Thailand.

They had a particularly close relationship with Leonard Bernstein, who became friends with the group first in 1973, when he composed a setting to an E. E. Cummings poem "if you can't eat."

[3] Since 1989 the group has appeared four times at Carnegie Hall: debuting there to a sold-out audience in 1989 at a concert to benefit world hunger, in the spring of 1995 in an American Red Cross benefit, in May 1998 in a concert for Mothers Against Drunk Driving, and most recently at Zankel Hall in March 2008.