What musical starred-in by Ramin Karimloo originally featured the character Christine Daaé?
The Phantom of the Opera
Title: The Phantom of the Opera (1986 musical)
Passage: The Phantom of the Opera is a musical with music by Andrew Lloyd Webber and lyrics by Charles Hart and Richard Stilgoe.  Lloyd Webber and Stilgoe also wrote the musical's book together.  Based on the French novel "Le Fantôme de l'Opéra" by Gaston Leroux, its central plot revolves around a beautiful soprano, Christine Daaé, who becomes the obsession of a mysterious, disfigured musical genius living in the subterranean labyrinth beneath the Opera Garnier.
Title: 'Til I Hear You Sing
Passage: "'Til I Hear You Sing" is a song from the musical "Love Never Dies", the 2010 sequel to "The Phantom of the Opera".  It was originally performed by Ramin Karimloo as the Phantom during the London run and was recorded with him for the original London cast album.
Title: Ramin Karimloo
Passage: Ramin Karimloo (Persian: رامین کریملو‎ ‎ ; born September 19, 1978) is an Iranian-Canadian actor and singer, recognized chiefly for his work in London's West End.  He has played leading male roles in both of the West End's longest running musicals: The Phantom and Raoul in "The Phantom of the Opera", and Jean Valjean, Enjolras, and Marius in "Les Misérables".  He also originated the role of the Phantom in Andrew Lloyd Webber's "Love Never Dies", which continues the story of "The Phantom of the Opera".  He made his Broadway debut as Valjean in the 2014 revival production of "Les Misérables", for which he received a Tony Award nomination.
Ramin Karimloo The Phantom of the Opera (1986 musical)