These trios include a variety of tempi, key signatures, and all parts are featured throughout. The voicing are spread, often in triads and some tone clusters are judiciously used. If you enjoyed the first two volumes, you're sure to love these!These grade 4 trios include a variety of tempi, key signatures, and all parts are featured throughout. The voicings are spread, often in triads and some tone clusters are judiciously used. If you enjoyed the first two volumes, you're sure to love these!