Umphrey’s McGee is auctioning off the costumes from their Halloween Mash-up show on eBay. Half of all proceeds will go to People’s Music School efforts to support their mission of providing free classical music training and education to children. As the band explains, “Winner can opt for costume as is (unwashed, wine stains and all) or cleaned. Add to your collection of UM memorabilia or pick up a truly one of a kind holiday gift for the phreak on your list, while giving back to the kids. Happy Bidding.” Each costume will also come with a signed photo. So if you want to dress like “Keith Richard Simmons,” “Karate Kid Rock,” “Vince Neil Armstrong” or one of the band’s other characters, head over to the band’s eBay page.