It seems like stunts designed to garner maximum amounts of publicity have become an integral part of every major band’s marketing scheme these days. However, that might not be a bad thing for music fans. Coldplay has announced that they will play a free show on June 23 at Madison Square Garden and will giveaway their new single, “Violet Hill,” for one week. The catch? You’ll have to visit the band’s website tomorrow after 7:15 EST to get details about the free MSG gig and snag the single. Coldplay will also play a free show at Brixton Academy in London on June 16. All of these shenanigans are designed to promote the release of the UK outfit’s forthcoming Viva La Vida (which was produced by Brian Eno and Markus Dravs), the follow-up to 2005’s X&Y which sold 10 million copies worldwide. Attention vinyl collectors: A seven-inch version of “Violet Hill” will be given away on the cover of the May 10 edition of NME.