Bizarre Painting of Crowd Fleeing Macbeth Opera

Titled "Ungase – Overture, Macbeth," this oil on board appears to show a frightening, supernatural occurrence on the stage. The crowd's in a panic. The painting was done by English artist Michael Harvey in 1975. It's framed under glass and measures 17 inches by 23 inches. Also written on the back of the frame is "Prelude to Macbeth." There is a nearly impercetible small tear next to the woman's hand bottom left. $650