To the Beat of Rock and Roll [Al compás del rock and roll]

When a romantic orchestra won't change their boring style into something more modern to get gigs, their girlfriends split and form a rock and roll orchestra that quickly becomes talk of the town. The guys are furious since they are relegated to their opening act as a comical number, but when the League of Virtue protests against the new satanic music, the old-fashioned music seems to win the day.