Yesterday's puzzle (with solution)

  Yesterday on Twitter I posed a puzzle.
  Here's a tune. Tell me what it is.
  I was hoping to get pointers to web services that do this, and I sure did!
  The most commonly suggested was SoundHound. But my query stumpted it.
  Here's me humming the tune.
  The human search engine worked.
  Lance Knobel correctly identified the tune. (Thanks!)
  Rather than spoil it, I've hidden the solution under this headline. Just click the plus to the left to get the answer.
    John Philip Sousa's Stars and Stripes Forever.
    Beautiful song!