<iframe width="560" height="315" src="http://www.youtube.com/embed/fZUGtpJsyks" frameborder="0" allowfullscreen></iframe> <br> What’s the recipe for a viral video? The rock-pop band Atomic Tom seems to have found at least one answer: a talented set of musicians, AT&T smartphones and an unsuspecting subway car full of New York straphangers. Atomic Tom surprised a B train of commuters with an impromptu [performance](http://www.youtube.com/watch?v=NAllFWSl998) of their first single “Take me out” using smartphones as instruments. The video scored millions of views online, and the song rose to Top 20 of the Alternative Chart. AT&T caught up with the band at SXSW this year.