British metal legends IRON MAIDEN will headline the Turkish edition of the Sonisphere festival, which is set to take place on Sunday, June 19 at Kucukciftlik Park in Istanbul. Also scheduled appear are ALICE COOPER, SLIPKNOT, IN FLAMES and MASTODON.For more information, click here. All IRON MAIDEN shows for 2011 have now been announced. Billboard.com reported last month that IRON MAIDEN rankeds third — behind LADY GAGA and PRINCE — on the Hot Tours list, with totals reported from its "Final Frontier World Tour" that began in June 2010 and included dates in both North America and Europe. The tour resumed in 2011 with a February 11 concert in Moscow at Olympiski, a massive indoor arena built for the 1980 Summer Olympics. Attendance for the performance in Russia was 16,439 with ticket sales topping $2 million (US$). A show in Singapore followed on February 15 with 9,785 in the house at the Singapore Indoor Stadium, the country's largest indoor entertainment venue. IRON MAIDEN was honored with a Grammy in the "Best Metal Performance" category in the pre-telecast ceremony at the 53rd annual Grammy Awards, which was held on February 13 at the Staples Center in Los Angeles. IRON MAIDEN was nominated for the track "El Dorado", from the band's 2010 album "The Final Frontier". "The Final Frontier" sold 63,000 copies in the United States in its first week of release to enter The Billboard 200 chart at position No. 4. "The Final Frontier" was IRON MAIDEN's fourth U.K. No. 1 album. The band previously topped the chart in 1982 with "The Number of the Beast", in 1988 with "Seventh Son of a Seventh Son" and in 1992 with "Fear of the Dark".