Possible Clues:

• 'Mr. ___' (1983 Styx hit)
• Surname in a 1983 Styx hit
• Surname in a classic Styx song
• "Mr. ___" (1983 hit by 69-Across)
• Mr. in a 1983 Styx hit
• "Mr. ___" (Styx song)
• “Mr.” in a Styx song
• Styx "Mr. ___"
• Surname in a Styx song
• 'Mr. ___' (Styx hit)