Assume that Jack hires Rachel's band to play at his daughter's wedding. Both Jack and Rachel agree on a date (February 1, 2018 - the date of the wedding) and they also agree on a price ($2000.00 for 4 hours of music). A week before the wedding, Rachel calls Jack and tells him that she is sorry but her band received another offer to play on February 1, 2018 for another wedding and her band would be paid $500.00 more. Jack tells Rachel that he will pay her the extra $500.00 if she keeps her date for his daughter's wedding. Rachel's band does play at the wedding of Jack's daughter and, at the end of the 4 hours, Jack gives Rachel only $2,000.00. Rachel demands the extra $500.00 and Jack says no. If Rachel sues Jack, based on what we have studied, who would win? What contract legal theories would Rachel rely on? What contract legal theories would Jack rely on?