Mon cœur s'ouvre à ta voix
The aria is written in D-flat major. The verse has a time signatures of 3/4 but the refrain ("Ah! réponds") has a time signature of 4/4. The tempo indication is andantino (=66) for the verse and un poco più lento (a little slower) for the refrain. The vocal range extends from B-flat4 to G-flat5, with a tessitura from E-flat4 to E-flat5.