Founded by Christine Cox and Matthew Neenan, Philadelphia’s BalletX is a magnet for classically trained dancers with an appetite for daring, inventive choreography. Risk-takers and rule-breakers all, the company has produced an astounding 100 world premieres in 16 years, having emerged as the “go to” launch pad for a diverse body of international choreographers. Its Williams Center debut shows just how versatile BalletX can be, and features Amy Siewert “It’s Not a Cry,” set to Jeff Buckley’s haunting cover of Leonard Cohen’s “Hallelujah,” and Caili Quan’s flirty “Fancy Me.” Additional works will be announced.