Possible Clues:

• Jacob whose ghost appears to Scrooge
• Bob who sang "One love, one heart / Let's get together and feel all right"
• Jacob --, character in 'A Christmas Carol'
• 'Bob ___ Rises From Grave To Free Frat Boys From Bonds Of Oppression': 'The Onion' headline
• Scrooge's business partner
• ''World's worst dog'' in a 2005 book
• Jacob --, Ebenezer Scrooge's deceased business partner who became a ghost
• Dreaded musician of the 1960s-'70s
• Fictional ghost