Either 2004 or 2005. Amazing show. I think they had been booked kinda last minute so it was super informal; they came out piecemeal, one playing a solo song, the other playing a solo, then playing a song they were both featured on. They were even asking the crowd for song suggestions, that's how laid back the whole thing was.

One of the cooler shows I've ever attended just cuz of how different it was. Plus they were both two of my absolute favorite artists at the time so I knew pretty much all the songs which obviously makes any show that much better.