Ah! quel plaisir, ah! quel beau jour!

'Ah! quel plaisir, ah! quel beau jour!' is a duet from act 1 of the opéra comique Cendrillon by Nicolas Isouard. It is sung by Clorinde and Tisbé. The vocal range needed for Clorine is low A3 to high C6, and the range needed for the part of Tisbé is a low B♭3 to the high B♭5. The part of Clorinde in this duet features a near two-octave tessitura (C4 to B♭5), while Tisbé has the tessitura of E♭4 to A♭5 in this piece.

Interpolations

 * In a recording of Cendrillon from 1957, the soprano Margot Risa interpolates a short high E6 in a coloratura phrase and a sustained E♭6 at the end of the duet.
 * The soprano Hyeree Shin does a sustained high E-flat near the end of the duet in a 2018 recording.