Jennifer Lopez, Pitbull: Reteaming again a year after “On the Floor” soared to No. 3, the pair sends “Dance Again” onto the Hot 100 at No. 27 with 118,000 downloads sold, according to SoundScan, after the new collaboration’s video premiered on “American Idol” on April 5. “Floor” sold a heftier 223,000 in the week following its “Idol” premiere – and debuted at No. 9 – in March 2011.