Music bingo is very much like traditional bingo, either UK or US versions.
Your bingo ticket has the answers to the music questions (the style of music is up to you, but usually it's hits from the 1950's to current times), usually the name of the song you are hearing or the performer. Cross off the answers as the music is randomly played.
Not even I know the order the music will be played in! 
Usually tickets are played for both a line and a full house.
A fun mix of music and bingo!