A new remastered and expanded edition of the Rolling Stones’ Goats Head Soup album will debut in September, and along with clearer sound and a new mix, the band is adding bonus tracks so that you’ll buy the record again. One of these bonus tracks is a never-heard collaboration with Led Zeppelin guitarist Jimmy Page. The song, titled “Scarlet,” was originally a demo that was never added to any of their albums…..and its really good. In fact, it makes you wonder why it took 46 years for the song to be unveiled. You can hear it for yourself below.