Exercises of the Scales, Arpeggios, and Melody Riffs categories are identical in that they are formulated so that we can initially learn the part to sing at the tempo of 80bpm with the piano, pushing it through the appropriate range of the exercise. Then, increasing the tempo twice to 100bpm and 120bpm the piano is accompanied by a professional studio quality backing track which is unique to each exercise. We use these tracks to our advantage building and perfecting all our vocal techniques and increasing our ear, tone, pitching, control, versatility, flexibility, range, dynamics, legato, etc. Then we have two additional tracks which are the backing tracks without the piano at the tempos of 100bpm and 120bpm so once we have learned the exercise well, we can practice singing our vocal techniques over the exercise without the piano at these two tempos. Lastly, we have another two piano tracks at the tempos of 140bpm and 160bpm where we can practice flexibility, versatility, and control techniques at an advanced level.
Exercises of the Vibrato, and Falsetto categories are structured slightly differently. Instead of tracks at tempos of 100bpm, 120bpm, 140bpm, and 160bpm we have tracks at tempos of 90bpm, 95bpm, 100bpm, and 105bpm with the two backing tracks at the tempos of 95bpm and 100bpm. This is because the vocal techniques suited for these exercises should be mastered and sung at a comfortable speed. Vibrato and Falsetto exercises still come with the initial piano track at the tempo of 80bpm.
Lastly, exercises of the Rhythm category are structured with only four tracks. The track tempos are 80bpm, 90bpm, 100bpm, and 110bpm. The tracks at the tempos of 80bpm and 90bpm are just piano tracks and the tracks at the tempos of 100bpm and 110bpm include a drum groove appropriate to the accompanying exercise rhythm. No backing tracks are given for rhythm exercises because it is more than adequate to practice the varying rhythms and appropriate vocal techniques against the drums with just the piano than to consider how difficult they would be with backing tracks.