Possible Clues:

• Walt's brother
• Rogers who was elected twice to the Country Music Hall of Fame
• Media mogul Thomson
• Three-time N.L. MVP Campanella
• Man in a colorful mnemonic
• 'Rob ..., ... Rogers (3)'
• Campanella of Ebbets Field fame
• "Oh, Pretty Woman" singer Orbison
• Outlaw Rob
• Country's Acuff or Clark