Who wrote the music for the play in which Morag McLaren played Carlotta?
Morag McLaren:  She enjoyed an 18-month West End run in "Phantom of the Opera" at Her Majesty's Theatre, playing Carlotta. The Phantom of the Opera (1986 musical): The Phantom of the Opera is a musical with music by Andrew Lloyd Webber and lyrics by Charles Hart and Richard Stilgoe.
Andrew Lloyd Webber