Possible Clues:

• Cab Calloway catchphrase
• Cab Calloway's signature line
• Catchphrase of Cab Calloway
• Cab Calloway trademark
• Signature line of Cab Calloway
• 1947 signature Cab Calloway musical
• Cab Calloway's ''kingdom''
• Cab Calloway's catchphrase
• Cab Calloway's 'kingdom'
• Cab Calloway, King of ___