Shari just stands there and stares at Shane. She has no musical instincts, only a vague notion of what 'Jazz' means and is confused about how any of this is going to involve preserved fruit spread in any capacity. What she
does have is another innate talent and her staring turns from confused to an almost uncomfortably intense gaze as she tilts her head to and fro, sizing Shane up as he plays. If he makes any indication he's about to stop playing she twirls her finger at him to indicate to keep going while she starts slowly circling around him. This goes on for much longer than is comfortable and a close observer might notice Shari's body-language gradually changing and getting closer to an approximation of Shane's, even if she doesn't outright shapeshift.
Finally she does lift the saxophone to her lips and starts
playing along. It's far from perfect but much more passable than her previous demonstration and she somehow manages to go without any interruptions to take a breath.