This is why I like big music festivals, you never know exactly what will happen because so many bands are there together and why not go on stage and jam with someone!
Kings of Leon were playing in Scotland at BBC Radio 1's Big Weekend and made the announcement that Chris Martin of Coldplay was coming to help them on a song. Watch the collaboration magic on the Kings' song "Fans"!
By the way, black sweater and white t-shirt, that's the look if you're trying to be a rock star now. I'm going to wear that out soon and see what happens.