allegro [I]—fast, lively tempo. From the Italian word for cheerful or gay.
andante [I]—moderately slow tempo (e.g. walking). Faster than adagio but slower than allegretto
baryton, bariton, paradon, viola di bordoni [I], viola di bardone [G]—bowed string instrument of the viol family; essentially a bass viola da gamba with an extra set of wire strings for resonating and plucking. The word relates to baritone in terms of range. The baryton can be traced in England to before 1625. In regular use in Europe until the end of the 18th century. wiki
cadenza [I]—a solo, typically near the end of a movement, showing brilliant, virtuosic and improvisatory expression. An apotheosis. Related to "cadence" and "close". Usually found within concertos.
chamber music, Kammermusik [G], musique de chambre [F], musica da camera [I], musica cameralis [L]—"Classical Music" for a small ensemble, generally 8 or fewer players with a canonical emphasis on 3-6 players. explore
espressivo [It], con espressione, expressif [Fr]—expressive, with expression.with feeling
fantastico [I]—fantastic, whimsical, capricious; in the manner of a fantasy
presto—very fast, more so than allegro.
quartet, quatuor [F], quartett [G], quartetto [I], cuarteto [S]—ensemble or work for four players the most important examples being the string quartet and the piano quartet
string quartet, Streichquartett [G], quatuor à cordes [F], quartetto d'archi [I], quartetto di cordi [I], cuarteto de cuerda [S], vonósnégyes [H]—an ensemble as well as music written for that ensemble comprising 2 violins, viola and cello. This is one of the essential genres / forms / ensembles of chamber music and arguably a critical "core" of "classical" music. Explore the string quartet.
violin sonata—a multi-movement work for violin and keyboard (or continuo) though there are sonatas for solo violin as well as sonatas in a single movement. While the violin would seem to be the featured instrument, many sonatas starting with the classical period find the piano to be an equal partner in the sense of a chamber work for two players.