T-ara's "Roly-Poly" has become 2011's top grossing song of the year thus far, thanks to its record $2 million USD in sales! The previous record was set by IU's "Good Day", which garnered $1.3 million USD. T-ara shattered that record with the wide appeal of their retro concept, which drew interest not just from young idol fans, but from older audiences who felt a touch of nostalgia when they heard the song. A representative of Core Contents Media said, "T-ara's 'Roly-Poly' has been at the top for 10 weeks, bringing in $2 million USD in sales." According to CCM, the song averaged $30,000 USD in digital sales per day, and came up as the top digital hit song of the year. "On August 1st, 'Roly Poly' recorded $200,000 USD alone, setting records all across the Korean digital music market. Hit albums usually only average about $300,000 USD in digital sales, so 'Roly-Poly' has definitely set a record that's hard to achieve in the market." While preparing to bid their fans farewell this week, the girls commented, "Thank you to all of our fans for giving so much love to 'Roly-Poly' over the past two months. We're glad we were able to bring up fond memories for our fans in their 40s and 60s." Source + Photos: Newsen via Nate