This document discusses various musical terms related to dynamics, tempo, descant, and round songs. It defines dynamics as the level of volume in music and lists symbols used to indicate crescendo and different volumes like mezzo forte. Tempo is defined as the speed of music, and a metronome is described as a device that indicates different speed levels. A round song is explained as a song where two or more groups sing the same melody starting at different times. A descant is defined as a countermelody sung above the main melody.