If you are in the Philadelphia area, two shows to check out this week in University City are Carl Grubbs's Ensemble performing "Coltrane Dialogues" at UPenn tonight (3/14/2007) and Coin Coin at the Rotunda, tomorrow.Carl Grubbs is the surviving member of the brother duo Earl & Carl Grubbs (a/k/a, the Visitors).Their 1974 album, "Rebirth" just swings and swings. It is only available on vinyl if you can find it. I'll write more and post something from it once I get a chance to rip something from the vinyl.Carl's cousin, Naïma, was John Coltrane's first wife, and the inspiration for the eponymous ballad. Earl & Carl received their early music training from John, and got to play with some top players as a result of the family contacts. _(A family meeting. That's Coltrane on the far left holding saxaphone, with Carl, Earl, and their father)_Stanley Clarke played bass in the Visitors before joining Return to Forever.Coin Coin is performing *free* on Thursday. In addition to Matana Roberts (pictured) reeds; the band includes Jessica Pavone, viola; Daniel Levin, cello;Keith Witty, bass; and Mary Halvorson, guitar.Jessica Pavone, her brother, Mario, and family have been getting a lot of positive press these days. Regretfully, I have been missing their shows.