These books are complementary to every harmonium learning method. They are two easy books with many songs that progress slowly, so that they can be understood and absorbed by the student, who usually takes fast steps in the method. The book is supplemented with information about the instruments (sounds) that the harmonium has, as well as the rhythms and effects. Also, a brief reference is made to the composer of each song. The book is further enriched with exercises - quizzes and musical crosswords that capture the student's interest.

The book includes:
- 40 well-known songs and melodies
- 100 exercises
- information about instruments, rhythms and composers
- quizzes and musical crosswords