I saw the Green­wich Music Festival’s impres­sive pro­duc­tion of Hans Warner Henze’s El Cimar­rón last night in Green­wich, Con­necti­cut, fea­tur­ing a singer, four dancers, and the Inter­na­tional Con­tem­po­rary Ensem­ble. Is it bad that I was inor­di­nately impressed by Claire Chase’s stun­ning vir­tu­os­ity, fash­ion sense, and melod­ica skills? The girl was jump­ing up to play per­cus­sion, run­ning back to her flute sta­tion while mak­ing click­ing and pop­ping sounds with her mouth, and blow­ing my mind with her bass flute.