US pop star Kelly Clarkson has guested on a track from Phantom of the Opera for Josh Groban's new musicals-themed album.

The pair duet on 'All I Ask of You', taken from the Andrew Lloyd-Webber penned musical. Other tracks on the album, titled 'Stages', include songs from The Wizard of Oz, Les Mis, Chess and Carousel.

Groban, as well as practicing the sort of 'popera' beloved of mammies everywhere, also has a belter of a voice and a good sense of humour - as his appearance on Never Mind the Buzzcocks (below) several years back attested to.

Hear Clarkson and Groban's duet now: