これ聞こえるかい？
http://graphics.nytimes.com/packages/audio/nyregion/20060610_RINGTONE.mp3
２５歳以上では聞こえないそうだ(;´Д`)
http://www.nytimes.com/2006/06/12/technology/12ring.html?ex=1307764800&en=2a80d150770df0df&ei=5090&partner=rssuserland&emc=rss