The open-house-style celebration in Wilmington and Milford will feature decade-themed music rooms tracing the school’s first century, live performances, and an instrumental “petting zoo”. WILMINGTON, Del. — The Music School of Delaware will celebrate its 100th anniversary on Sunday, Nov. 9, with coordinated festivities at its Wilmington and Milford campuses. The main event runs 4–7 p.m. at 4101 Washington Street …