The first piece of music discussed in this chapter, by Debussy, was turned into music for a ballet, and the last piece, Ravel’s Bolero, was created as a ballet. Obviously, speed or tempo is very important to dance, whether you’re moving to a waltz or to electronic dance music (EDM). But composers and conductors don’t always agree on what the correct tempo is for a particular classical piece. A composer might indicate a tempo by giving it a metronome marking, but a conductor can ignore that and place his or her own stamp on the interpretation.
Watch two different videos of one and the same choreography of Ravel’s Bolero (1928). The costumes, scenery, and dance steps are exactly the same in both. Only the tempo of the music is different. Watch some of the beginning and particularly the end of each video.

https://www.youtube.com/watch?v=sQ2chcGOJgY
Which performance—the first or the second—has the faster tempo, and which do you think makes for a more effective expression of the dance?