Depends on the show. I've been to dozens at the Tower. Radiohead, Beck, R.E.M., X, EC & The Attractions (and/or The Imposters) people pretty much stand throughout. EC & Steve Nieve, Decemberists, Sufjan Stevens, Lyle Lovett, people pretty much sit. Iron and Wine feels like a sitting show to me. The worst venue for this in the area is the Keswick. Wilco, sit or stand, not a big deal to me, it's not like I'm dancing to "On and On" or "Impossible Germany" but I've seen Los Lobos a couple of times at the Keswick and for LL I've got to move around. At the Keswick they make you sit.