Vintage boomer tours have gotten so numerous that acts are now apparently going out on the road in alphabetical tandems. That would explain the charmed Paul Simon/Sting commingling at the Wells Fargo Center on Friday night.
In a brisk and deftly paced evening, the two singer/songwriters alternated solo sets with collaborative segments. But the most poignant moments came unexpectedly, when they interpreted each other's songs - Paul Simon singing "Fragile" to Sting's flamenco guitar accompaniment and Sting, after recalling his first show in Philadelphia with the Police at Grendel's Lair on South Street, serenading the crowd with Simon & Garfunkel's "America." (By serendipity, Art Garfunkel was also performing in Philadelphia on Friday night, at the Art Museum.)