As a result of streaming, two classic songs from Ozzy Osbourne have reached new sales milestones in the U.S. “Crazy Train” has been certified quadruple platinum by the RIAA (Recording Industry Association Of America) on September 1 for accumulating four million certified units. That same day, “Mr. Crowley” was certified gold for accumulating half a million units. According to the RIAA, one equivalent song unit is equal to a single digital song sale, or 150 on-demand audio and/or video streams.