As seen in the listed pic starting from top left....

#1 - Woody Allen, Mel Brooks, Bill Cosby

#2 - Orson Wells, Alfred Hitchcock, Robert Mitchum

#3 - Katherine Hepburn, Fred Astaire

#4 - George Burns, Jacky Benny, Bill Cosby, Lucille Ball, The Smoothers Bros

#5 - Stevie Wonder, George Harrison, Gary Wright, Ravi Shankar, Paul Simon

#6 - Jefferson Airplane, Joni Mitchell, Stephen Stills, David Crosby, Sly and The Family Stone, David Bowie