Cruella and Doc322,
When I visited Graceland, the docent used the phrase "Taking Care of Business" for "TCB." Since that's also a line from one of Elvis' songs, that has high credibility.
Unfortunately, I am accessing FunTrivia from the Admiral's Club at O'Hare Airport, Chicago, so don't have access to my references.
I'll be active in Fun Trivia again in a week or so when my travels decline for awhile.
Cordially,
Russ