Jennifer Lopez doesn't look like she's slowing down any time soon and is still serving "fierce", over ten years in the game. Taking the cheese board that is new single Dance Again [ review] to the stage on American Idol, the New York native put her money where her mouth is and pulled out an energetic performance for the crowd and judging panel she usually sits with.
Though this was definitely a different vocal from the CD version, was it actually live on the night? The intro and the first verse sure did sound live, but as for the rest I have doubts. Mainly because the dynamic (volume) of the vocal stayed pretty consistent throughout the entire performance, despite the rigorous routine.
Take a look at 4.11 and notice how Jennifer Lopez performs a jutting movement, where she violently contracts her abdominal muscles. Here there should have been an extra push of air generated, but nothing is heard on the microphone. Odd?
Live or not, it doesn't really matter, as not being known as a "vocalist" , Jennifer Lopez brought what she needed to the stage, and that was putting on a great performance.
If she was indeed singing live then I tip my hat to her, because doing so and dancing is only ever made to look this easy by one Mrs Carter-Knowles.