LOS ANGELES — Chuck Negron, a founding member of Three Dog Night whose lead vocals powered a string of hits including “Joy to the World,” “One” and “An Old Fashioned Love Song” for one of the top rock...

Chuck Negron, a founding member of Three Dog Night whose lead vocals powered a string of hits including “Joy to the World," “One” and “An Old Fashioned Love Song” for one of the top rock acts of the l...