Drummer Lewis Nash emerges as star of jazz supergroup Grand Slam at Blues Alley show

All bets are off for a jazz supergroup like Grand Slam. Audiences usually look for fireworks from the leader; knowledgeable fans might keep their eye on a key sideman. But when guitarist Jim Hall, tenor saxophonist Joe Lovano, bassist George Mraz and drummer Lewis Nash unite -- as they did at Blues Alley on Thursday -- who's the star?