The sale of Pink Floyd’s music catalog, which reportedly could fetch about $500 million and is touted as one of the biggest music rights deals in history, is still hanging in the balance as the band’s members fail to reach an agreement over taxes, assets and bassist Roger Waters’ views on Ukraine. That’s according to the Financial Times, which, citing several people involved in negotiations, reports that the auction process is still in limbo about five months since it started, with the members of the British band butting heads over the tax structure of the deal. Since the sale process started, reports have suggested that the catalog has attracted interest from potential buyers like Sony Music Group, Warner Music Group, BMG, Hipgnosis, Concord, Primary Wave, and private equity group Blackstone.