John Bischoff and Mark Trayle + John Butcher

English saxophonist John Butcher is a jaw-dropping technician, equally capable of brawny assault and textural meditations at the very edge of audibility. What makes this veteran experimentalist so compelling, though, is the taste and poetry behind everything he does. Joining Butcher on tonight's bill is the electronic-music duo of John Bischoff and Mark Trayle.