title: iTunes Store API -- sorting by popularity
body: <p>Is it possible to search the <a href="http://www.apple.com/itunes/affiliates/resources/documentation/itunes-store-web-service-search-api.html" rel="noreferrer">iTunes Store API</a> and sort results by popularity?</p>
  
  <p>If not, what is the next best alternative? Screen-scraping the <a href="http://itunes.apple.com/us/artist/jack-johnson/id909253?ign-mpt=uo%3D4" rel="noreferrer">iTunes Preview</a> pages?</p>