The city’s ever-expanding dance scene has made it an increasingly appealing––and affordable––option for dancers.   Above: Artistic director Roy Kaiser has expanded PA Ballet’s Balanchine-based repertoire to include modern works by Merce Cunningham and David Parsons, as well as contemporary ballet choreographers like Jirí Kylián, William Forsythe (his Artifact Suite pictured above), and Alexei Ratmansky. […]