Pittsburgh-based guitarist Jimmy Ponder strums with his right-hand thumb, a somewhat unorthodox way of approaching the guitar even though it did anything but hold up the late great Wes Montgomery. The bottom line, however, is that it’s not so much about how a musician plays, but what he plays. And here, in the presence of bassist Dave Pellow and drummer Cecil Brooks III, Ponder amply demonstrates what he can do musically on Thumbs Up, his first-ever trio recording.