The Ensemble Books contain eight 4-part ensembles, carefully coordinated with material in the Lesson Books. Part 1 is a selected favorite from the Fun Book or the Recital Book. Parts 2, 3 and 4 use the same concepts and hand positions at the same level of difficulty. Includes suggested electronic sounds for those ensembles using electronic instruments. "Whoopee Ti-Yi-Yo" is a Federation Festivals 2016-2020 selection.