calmo [I], calmato, calme [F]—calm, tranquil, quiet, still
chamber music, Kammermusik [G], Musique de chambre [F], Musica da camera [I]—"Classical Music" for a small ensemble, generally 8 or fewer players with a canonical emphasis on 3-6 players
Deploration, Déploration [F]—the act of deploring or lamenting, lamentation; French: in particular a composition of the Medieval and Renaissance eras inspired by the death of a composer, commonly written in the Phrygian mode
duo, duet, dueto [S], duetto [I], duett [G]—a work for two instruments; the ensemble itself
elegy, elégie [F], elegie [G], elegisch, elegiaco, elegaico [I], élégiaque [F]—a plaintive, mournful poem, more specifically a lament for the dead. Usually implies a slow tempo, a minor key and a dark poignancy with potential spikes of tragic agony or, just as well, a gentle, bright flowering into nostalgic love of great tenderness. A musical narrative combining all of these moods is a hauntingly faithful representation of grief
scherzo—lively, brisk, typically in a triple meter; usually a three-part form with central, contrasting trio
sonata, sonate, suonato—a complicated term. Originally, "sounded" rather than "sung" (sonar vs. cantar), e.g. instrumental music. According to historical period, sonata began to imply a formal plan of movements as well as the structure within a single movement, e.g. sonata form. In general usage as a work title, it designates a multi-movement piece for solo or duo instruments with one of the instruments enjoying a feature role.
with thinking heart and feeling mind, I'll embody your muse, thy soul divine