Saw SOAD a while back because TMV was opening for them. TMV played 3 songs in an hour-long set and the guitar-vocal battle was the best part of the whole concert. SOAD was surprisingly very, very good live. I don't like much of their music other than their first couple of albums, which they seemed to shy away from. But when they played the songs I like, I loved it. Serj can ****ing belt it. He's got an amazing voice.
Best show I've been to was the A Perfect Circle show with The Mars Volta opening a number of years back. My first time seeing TMV and the first time I was ever introduced to them. APC was spot-on for the entire show and the closing with "Gravity" sent chills down my back for the entire 6:00 it went on. That concert literally changed my life (I got to discover TMV)