Charli a poor musician needs $1500 fast to pay his back rent and buy food stand agreed to launch on the $1500 except as collateral Charlie's saxophone they put their agreement in writing and sign it Charlie keeps possession of the saxophone so he can play gigs to make money and eventually pay Stan back explain does Stan have an enforceable security interest ? if so how can stay and let other creditors know of your interest in the saxophone ? if not how can he get a security interest in the saxophone?