It has not been taken offline. The OP changed the link to point to the "updated" version of the story while the original one is still at http://www.npr.org/blogs/krulwich/2011/05/02/134597833/cosmo... which still has the audio file and link to buy it on amazon.
Odd, I actually tried to open the link and it redirected me to the homepage of the Amazon MP3 Store, so I assumed the song had been taken offline. Sorry.
It has, in fact, been taken offline. (Along with the whole collection of "sound effects".)