A series of popular, and often overplayed, broadway songs taken out of their original context to create a pseudo show with a lack of plot. These shows are often performed by singers who are not talented enough to be cast in the original works. The "audiences" of these shows are usually people who claim to love musicals, but think the libretto and plot are too complicated in comparison to the song's chord progressions.
Man 1: Hey, Frank and all of his little high school friends are putting on a cabaret. Do you want to go?