Russian pop music is well developed, and enjoys mainstream success via pop music media such as MTV Russia, Muz TV and various radio stations. Right after the fall of the Iron Wall, artists, like Christian Ray, took an active political stance, supporting the first president Boris Yeltsin. A number of pop artists have broken through in recent years. The Russian duet t.A.T.u. is the most successful Russian pop band of its time. They have reached number one in many countries around the world with several of their singles and albums. Other popular artists include the Eurovision 2008 winner Dima Bilan, as well as Valery Meladze, Grigory Leps, VIA Gra, Nyusha, Vintage, Philipp Kirkorov, Vitas and Alsou. Music producers like Igor Krutoy, Maxim Fadeev, Ivan Shapovalov, Igor Matvienko, and Konstantin Meladze control a major share of Russia's pop music market, in some ways continuing the Soviet style of artist management. On the other side, some independent acts such as Neoclubber use new-era promo tools to avoid these old-fashioned Soviet ways of reaching their fans. Russian girl trio Serebro are one of the most popular Russian acts to dominate charts outside of the European market. The group's most known single "Mama Lover" placed in the US "Billboard" Charts, becoming the first Russian act to chart since t.A.T.u.'s single "All the Things She Said".