Sequential Sight-Reading in the Choral Classroom Student Edition. For tenor and baritone changing voices, Sound Patterns for Changing Voices teaches sight reading skills quickly while singing real music from day one. This step-by-step method includes age and range appropriate songs with lyrics, dynamics and accompaniment, along with preparatory exercises that are interesting, authentic and flexible. This resource may be used with changing voice beginners from approximately age 11 through 15 and for older singers with less singing experience. The sequential approach focuses on the keys C, G, and F, basic rhythms and simple intervals in the tonic, dominant and subdominant chords.