3 examples for play

  # Play song with 1.5 faster tempo
play song.mpe tempo 1.5
        

  # Play song in different pitch (transpose song 1 tone up)  
play song.mp3 pitch 200

# Transpose song half tone down
play song.mp3 pitch -100
        

  # Plays a 440Hz sine wave
play -n -c1 synth sin 440