No, it wasn't. ''Big In Japan'' reached No 66 in U.S. Billboard Hot 100.
You cant really answer this question because everyone has a different opinion. Its 2010 at the moment. What if someone looks at this question in 2 years time? The music style/genre would have changed...
As of 2011, the most popular song in the US is probably Firework by Katy Perry.
City is ours
Worldwide City Is OursTil I Forget About YouFamousIf I Ruled The World
Savoir Adore Performing Early Bird Live at Brooklyn Bowl
Playing an Accordion Through Afghanistan
Guitar Tricks - Songwriting Tips
Video: Taylor Swift's Teenage Tantrum