Tempo is the speed in which music is played in. It is counted in beats per minute (BPM). Since there are 60 seconds within a minute, a tempo of 60BPM would mean that each beat is exactly 1 second apart from the next. So if we are to say ‘How fast should I be playing “Guren no Yumiya”?’, the answer would be ♩ = 90BPM (♩ is a quarter note). Meaning that within a minute, there should be 90 beats and that each beat should have a certain value, which in this case would be a quarter note.