The Armenian soprano made her Royal Opera debut early to thundering applause. Petite and vulnerable in manner, she brought humanity to a part which can seem chilly. If at times her voice seemed confined, by her final outpouring as she bids farewell to her beloved Carlos, she suddenly let rip. This chimes with the demands of text and music: until that point, she is forced to repress her feelings. Haroutounian seemed to pull forth ever-increasing vocal powers until you thought her heart, or yours, would burst.