Friday September 20, 7:30 p.m. and Sunday September 22, 2:30 p.m. Shaftman Performance Hall, Jefferson Center, 541 Luck Ave. S.W., Roanoke VA. Before Pennywise, there was “Pagliacci.” OK, so Stephen King’s mega-selling horror book and movie franchise “It” and Italian composer Ruggero Leoncavallo’s 1892 operatic masterpiece don’t actually have much in common, other than the unnerving trait of associating malevolent clowns with murder.