The concert documentary "Wattstax" was released 50 years ago this month. It featured Stax Records' entire roster at the time. NPR's Ayesha Rascoe talks to James Alexander of the Bar-Kays.

The Bar-Kays On Sept. 28, the Shell will see legendary Memphis soul/funk/R&B outfit The Bar-Kays take the stage as part of the celebration of the group’s 60th anniversary.