Yeah, I just heard about this, and let me tell you, despite the message 4Kids was getting across, it was bad. Basically done to celebrate the fourth of July, 4Kids TV made this commercial where they have their VAs sing lines for the national anthem, and have the recorded lines said by the characters they voice.
While it is nice, there are a few problems with it. One of them is the characters chosen. Other than Raphael and Michelangelo from Teenage Mutant Ninja Turtles, the characters used are from anime and cartoons from other countries (Mew Mew Power being a horrid localization of the Japanese anime Tokyo Mew Mew, and Winx Club being an Italian cartoon). While younger kids may think it's neat at the time, older anime fans would see this as another blatant example of how 4Kids does not just dub anime, they localize it to remove any elements that they believe American kids would not understand (I mean, their dub of the first few seasons of the Pokémon anime had characters eating rice balls while calling them donuts, despite not looking like donuts).
Another thing rating this low is how lazily it was put together, as they just put in scenes from the anime and cartoons, they aired at the time and changed only the voice lines, and most of the VAs do a horrible job singing (whoever voices Luffy for 4Kids made him sound annoying, and the only good voices are Sonic, and suprisingly, Master Splinter, whose VA knew it was bad, he decided to sing his line like an opera singer, which earned a second star). Yeah, this is bad, but somehow, so good, they make a new version for the next year, which replaces Mew Mew Power and One Piece with characters from Viva Pinata, Chaotic, and 4Kids' other anime cash cow, Yu-Gi-Oh!