I attended the show last week. From the reviews, I knew it was a highly rated show, and I had a great expectation. It met my expectation and more!
They mostly sing 60s and 70s songs, but they updated their song choice recently and *relatively* recent hits like Bruno Mars, Back Street Boys/'N Sync were included to give more varieties in the song list.
I have seen a part of their PBS special with Motown songs. I thought this live show was much more lively and hip than the Motown special.