The duet will appear on Bocelli's new album.

Ariana Grande is a bona fide pop star but in her newest collaboration, she's gone opera with Italian great Andrea Bocelli. 

The two teamed up for "E Piu Ti Penso" from the Sergio Leone crime drama Once Upon a Time in America, which will appear on the classical tenor's new album, Cinema. The duet is beautiful and moving on the song, composed by Ennio Morricone. 

As the album title suggests, Bocelli's Cinema is filled with songs from a number of films. It will be released Oct. 23. 

Listen to Bocelli's and Grande's "E Piu Ti Penso" here.

This story first appeared on Billboard.com.