adagio [It]—slow tempo, often implying a lyrical, poignant character
allegro—fast, lively tempo
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
Flute quartet—Common name for popular chamber ensemble (work) comprising flute, violin, viola and cello (rather than 4 flutes!). This ensemble was especially popular in the "gallant" early classical period particularly for domestic music making by royal and common flutist alike.
moderato [I], moderamente, modéré [F], modérément [F]—moderately, at a moderate tempo, applying a touch of restraint to its related word(s), e.g. allegro moderato
quartet, quatuor [F], quartett [G], quartetto [I]—ensemble or work for four players the most important examples being the string quartet and the piano quartet
rondo—sectional movement form featuring a recurring refrain between contrasting episodes in a variety of plans, a typical one being ABACABA (A is the refrain; B and C are episodes). Often used for finales.
with thinking heart and feeling mind, I'll embody your muse, thy soul divine