In the piece below the music will begin piano and then crescendo to forte.
It will do that same volume a second time - begin piano and then crescendo to forte.
The music will repeat a third time but this time it will begin piano, crescendo to forte, and then continue getting louder to fortissimo! It is a very exciting piece of music.
Listen and watch below. See how the conductor lets the instrument players know when to be soft and when to be loud.