A Due (a2)
Intended as a duet
Assai
Very
Con Brio
With vigor or spirit
Calando
Falling away, or lowering; i.e., getting slower and quieter; ritardando along with diminuendo
Col , Coll’, Colla, Colle
with the (col before a masculine noun, colla before a feminine noun)

Colla parte = with the soloist (director has orchestra follow them)
Colla voce = with the voice (director has orchestra follow vocal soloist)
Col legno = with the wood (players strike the string with the stick of the bow)

Dal Segno
Repeat from the sign
Divisi
Divided, split parts
Dolce
Sweetly
Dolente
Sorrowfully, plaintively
Duramente
With hardness, firmly
Expressivo
Expressively
Focoso
Passionately, Fiery
Giocoso
Playfully, jokingly
Gioioso
Joyfully, blithely
Lento
Slowly
Mosso
Moving (piu mosso or meno mosso, for faster or slower respectively)
Ossia
alternate section or passage of music; or instead; i.e., according to some specified alternative way of performing a passage, which is marked with a footnote, additional small notes, or an additional staff
Piacevole
Pleasing, agreeable
Piacere
To be pleasing
Ravvivando
Quickening Pace