So I just got back from some studying in Europe for two weeks and in that time, I heard this song on CHRs in London, Brussels, and Amsterdam, joining "Call Me Maybe", "Payphone", and "We Are Young" as songs that I heard quite a bit of overseas. After checking the charts, it seems "Whistle" is doing very well in all three of the countries I visited, in fact debuting at #2 in the UK! How far will this song go in the States is what I'm curious of. I'm guessing top 15, maybe a low top 10. Any guesses?