adagio [It]—slow tempo, often implying a lyrical, poignant character
attacca [I]—to continue from the current movement to the next without a break or pause. From the Italian "to attach"
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
larghetto—slow, but a bit faster than largo
nocturne [F], notturno [I], nocturno, Nachtstück [G]—Night music. A romantic character piece depicting moods of the evening or night: quiet, reflective, perhaps romance and melancholy or even restlessness and fantasy. The most famous nocturnes come originally from the piano literature, e.g. John Field and Chopin, et. al.
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
scherzo—lively, brisk, typically in a triple meter; usually a three-part form with central, contrasting trio
serenade, serenada, serenata [I], sérénade [F]—A suite of movements like a divertimento with similar connotations of lightheartedness, pleasure and relative calm with an emphasis on lyricism and often beginning with a march. Historically evokes the evening, outdoors, an honorific or amorous tribute, especially from a suitor to a lover in a window or balcony. The word serenade has its Latin origins the Latin word for "calm" or serene. wiki
tempo, tempi [pl]—speed or pace at which music progresses. Traditional classic music typically uses standard Italian words to designate the tempo, e.g. Allegro or adagio. Metronome markings provide precise numerical speeds. Tempo selection during performance is a complex artistic choice informed by composer's markings, performance tradition, technical limitations and interpretation.
vivacissimo [I]—very vivace: very vivacious and lively
waltz, valse, walzer, alla valse—a popular dance introduced in Vienna in the 1780s usually in 3/4 time. wiki