In 2002, Michael Sabol, doing business in the recording industry as Sound Farm Productions, applied to Morton Community Bank in Bloomington, Illinois, for a $58,000 loan to expand his business. Besides the loan application, Sabol signed a promissory note that referred to the bank’s rights in “any collateral.” Sabol also signed a letter that stated, “The undersigned does hereby authorize Morton Community Bank to execute, file and record all financing statements, amendments, termination statements and all other statements authorized by Article 9 of the Illinois Uniform Commercial Code, as to any security interest.” Sabol did not sign any other documents, including the financing statement, which did, however, contain a description of the collateral. Less than three years later, without having repaid the loan, Sabol filed a petition in a federal bankruptcy court to declare bankruptcy. The bank claimed a security interest in Sabol’s sound equipment. What are the elements of an enforceable security interest? What are the requirements of each of those elements? Does the bank have a valid security interest in this case? Explain.