Performance Today has spent the past few days visiting with artists at this summer's Aspen Music Festival. The trip ends with this performance, as violinist Gilles Apap and a pair called the Transylvanian Mountain Boys join Fred Child on stage in Aspen's Harris Hall. Apap starts out solo, playing the Sarabande from Bach B Minor Partita and a couple of Irish reels. Then, the Transylvanian Mountain Boys — guitarist Christopher Judge and double-bass player Brendan Statom — join him to play a pair of Romanian folk tunes, and a little swing by Django Rhinehart. They finish up with an improvisation on a Spanish dance by Manuel de Falla, sliding right into a gypsy tune called "Whistle."