All this week, we present the producers' favorites. Each day was programmed by a different " On Second Thought" producer and today , Trevor Young chooses his favorite music segments: First, bassist Stanley Clarke is a legend in jazz, a pioneer of the slap-bass sound. He’s performed on more than 40 albums and has won four Grammys. Clarke is back on tour and we spoke to him earlier this month before his concert at the Variety Playhouse in Atlanta. Then, s inger-songwriter Julien Baker admits she