Collaborations between classical and popular performers have included Sting and Edin Karamazov's album "Songs from the Labyrinth". A collaboration between Freddie Mercury and soprano Montserrat Caballé resulted in the worldwide hit "Barcelona". R&B singer Mariah Carey performed a live duet with her mother Patricia, who is an opera singer, of the Christmas song - O Come, All Ye Faithful. Welsh soprano Katherine Jenkins performed a duet with Rock-singer Michael Bolton of O Holy Night. Singers and instrumentalists from the classical tradition, Andreas Dorschel has argued, run the risk of losing the sophistication of the genre(s) they were trained in, when they try to perform rock music, without coming up to the often rough and wild qualities of the latter.