I got to see Coldplay in Boston at their 6th US show, Feb, 2001, at the Paradise in Boston. The crowd was sparse! They were an unknown band from the UK and Yellow hadn't fully hit yet! It was incredible. 3 months later, at the House of Blues, it was packed. I snuck in before the show during their soundcheck and had a nice little conversation with Chris afterwards. Ahh, the good c'old days! :)
