Steuart Smith, the longtime touring guitarist for the Eagles, on Monday announced his retirement due to complications from Parkinsonism.

With McDonald on board, however, the Doobies found a new audience in the adult contemporary genre, releasing hit singles and signature songs such as “What a Fool Believes,” “Minute By Minute,” “Echoes of Love,” “Takin' It to the Streets,” “Real Love,” “Little Darling (I Need You)” and more.