Designed to promote a thorough understanding of interval and tonality;
Incorporating a wide range of Hungarian folk music and poetry;
Here is a recommended order for approaching the exercises:
Let Us Sing Correctly forms, with the Fifteen Two-part Exercises, an introduction to the next volumes: 77, 66, 55, 44, 33 and 22 Two-part Exercises, (22 being the most challenging).
77 was created out of a need for something shorter and easier than the others (66 to 22) in the series.