If you are thinking of the song that goes "Rah Rah Ah Ah Ah Roma Ro Ma Ma Ga Ga Oh La La", then it's Lady Gaga's "Bad Romance"... This is the most popular currently.
However, there is a Song "Ga Ga" by Melanie C
Lady Ga Ga
Lady Goo Goo
her faxourite song she sings is umbrella her faxourite song she sings is umbrella
Taylor Swift sings Our Song.
-War sings that song.
One Republic sings the song Secrets. They also sings the song Stop and Stare which it is a good song.
These NUTS sings that song...
Usher sings the song "Yeah."
Rebecca Kneubuhl sings the song.
Akon, sings the song Smack That
Taylor Swift the country singer sings "Our Song".
Pitbull sings that cool song