“The first time I saw violinist Mat Maneri was at the Willow Jazz Cafe, a small bar in a suburb outside Boston. He was playing in a trio with guitarist Joe Morris and, more notably, his father Joe Maneri, the great saxophonist and devout free improviser. They played an abstract, completely improvised set, with lines that could rise to flurries or insinuate themselves as lightly as paper cuts. It wa”