The Irish singer-songwriter impressed with her still mighty vocal cords at Los Angeles' El Rey Theatre on Sunday night. It only took one song to reassure the crowd at Los Angeles' El Rey Theatre Sunday night that Sinead O'Connor's voice remains a mighty instrument. By the end of her assured cover of John Grant's “Queen of Denmark” — a true marvel of a tune, marrying sincerity and snark, despair and defiance — the Irish singer-songwriter made it clear that the fire still burns in her vocal cords. It was the first in a series of collective exhalations in the sold-out club over the course of her taut but heartfelt set, part of her first North American tour in over five years. To say the very least,