Acquisition of intervals, initially their types and later their size, takes place in the lower grades of elementary music schools. Besides, the subject Theory of Music is introduced in the last grade of the second cycle of education within which the acquired knowledge is systematized and revised. Practicing intervals is done theoretically, singing on pitch and within a melody. Songs and instrumental compositions (or their parts) which have a certain interval at the beginning are used in the process of the acquisition of sonority. Children can more easily recognize it by association with a familiar example. With this respect, the collection of songs 'We Sing Intervals - Functionality of Intervals and Chords' by Ljiljana Pantovic and Vesna Krsic Sekulic contains numerous compositions to be used when dealing with this matter. The authors of the article have invented the new models (20) with an intention to enrich the existing repertoire and to enable children to more easily acquire sonority of intervals by using songs with lyrics.