Don Henley, Jackson Browne and friends salute Linda Ronstadt at Parkinson's benefit

Fans and pop music critics alike have long extolled the power of Linda Ronstadt’s voice.

But the facet of her talent most consistently lauded Sunday night at the Theatre at Ace Hotel in L.A. during a star-studded salute to Ronstadt benefiting research into Parkinson’s disease was her ears.

That...