A Prince cassette with three previously unreleased tracks, early versions of “So Blue” and “Gotta Break Your Heart,” and an unfinished version of “Sometimes It Snows In April” is being offered up to the highest bidder. The going rate? $20,000. The cassette is from the late 1970s and belongs to former guitarist Dez Dickinson, who is currently overseeing the auction. We’re not sure why he’s letting it go, but if $20,000 seems a bit steep, check out our favorite cassette labels of 2015 for more reasonably priced tapes.