123. This exercise is conceived for you to work on standard structures within music. A musician must first master the beat, then the measure and, thirdly, the structures. These are usually based on 4, 8, 12 and 16 measures. Use them to practice breaks, solos,…Exercises 123 and 124 are with video and in 125 and 126 you’ve got a musical sequence to work on. Listen to your records and measure them: you’ll see that the structure follows those rules.