If you're playing as greedy bastard Vanilla you can make Connie pay you to defeat the Big Bad. Then during the middle of the fight, you can ask her for more money to pursue and finish him off. She explains that she has no more money, so Vanilla has her give him an I.O.U. that can be exchanged for UR in the year after mode.
Connie: "You're a jerk, you know that?"
After creating the electric guitar, you can play with Fennel's band and earn more money than you do with the Globetrotters. But Fennel's singing voice is laughably BAD.