 Go to their website, rockmm.org. That's rockmm.org. Experience the arts naturally at Seaside Pavilion in Old Orchard Beach. This Friday, don't miss the popular tribute show, Let's Hang On. Frankie Valli and the Four Seasons are an American treasure with songs like Big Girls Don't Cry, Walk Like a Man, and dozens of others that are timeless mementos of an era gone by.