(Kevin Winter/Getty Images for ABA)Life may be a waterfall, but for System of a Down, life is billions of streams. The band’s song “Aerials” is their latest to pass the 1 billion stream mark on Spotify. It marks the fourth SOAD track to join the Spotify Billions Club, following “Toxicity,” “Chop Suey!” “Aerials,” “Chop Suey!” and “Toxicity” are all songs off System of a Down’s 2001 album, Toxicity, which incidentally celebrates its 25th anniversary in September.