The difference between the music speed of 60 and 120 lies in the speed of the rhythm.

Music tempo refers to the playing speed of music, usually expressed in beats per minute. Tempo 60 means 60 beats per minute, while tempo 120 means 120 beats per minute. The music at speed 60 has a slower rhythm, giving people a relaxed and soothing feeling, and is suitable for expressing soft and warm emotions. The music with a speed of 120 has a faster rhythm, giving people a feeling of vitality and passion, and is suitable for expressing excitement and enthusiastic emotions. There are obvious differences in rhythm and expression between these two speeds of music.