Legendary rock band Kansas performs "Carry on Wayward Son" to open the Supernatural panel in Hall H at San Diego Comic Con 2017. Not my best filming, but I was in shock.
I really have no idea what the lines will be like this year. Just keep your eyes and ears open. If you want to be close you definitely need to show up early. I'm planning on early Saturday morning again sometime, but that could change depending on what I see and hear.