John Denver guest hosted Mama Cass, The Everly Brothers, The Isley Brothers, Harry Chapin, Linda Ronstadt, Argent and Helen Reddy. Among the musical highlights were Harry Chapin performing his hit "Taxi", Linda Ronstadt sang her popular ballad "Long Long Time", Helen Reddy sang "I Am Woman" and the Britsh group Argent performed their 1972 hit "Hold Tour Head High"