John Travolta Wannabe

It was announced on June 8, 2011 that T-ara would make a comeback in July with John Travolta Wannabe. It was also revealed that the lead single was composed by Shinsadong Tiger and Choi Gyu Sung, who had previously worked with T-ara on songs like "Bo Peep Bo Peep".[2] T-ara came up with the concept themselves after watching Saturday Night Fever.[3]

On June 24, Core Contents Media released a 59-second teaser of T-ara's title track "Roly-Poly". The video was released three days earlier than originally scheduled, due to the request of fans. The full 12.5-minute music video was released on June 28.[4] Musically, "Roly-Poly" was considered a remake of the Bee Gees' "Night Fever", and the video's choreography was called reminiscent of Saturday Night Fever, which starred John Travolta.[2]

In August 2011, "Roly-Poly" had become the top-grossing song of the year until that point with over $2 million in sales.[5]

On the Gaon Yearly 2011 Download chart, "Roly-Poly" was the best-selling song in South Korea with over 4,077,885 downloads.

Both albums charted on the Gaon Yearly 2011 Album chart, with John Travolta Wannabe selling 30,116 copies and the repackage Roly Poly in Copacabana sold 24,179 copies.

On August 1, Core Contents Media announced that a repackage of John Travolta Wannabe would be titled Roly-Poly in Copacabana and limited to only 10,000 copies. The repackage contains one new song, a Eurodance remix of "Roly-Poly" titled "Roly-Poly in Copacabana", which was named after the famous 1980s disco club.[6] The song premiered on August 2 while the music video was delayed until the next day. The revealing of "Roly-Poly in Copacabana" was pushed up an hour than originally planned, due to the urging of fans.[7]