Why can't I find anything about playing the song ';why can't we be friends'; by ';War'; piano, or find sheet music

I looked on youtube for people playing it, no one, I checked on Ebay for sheet music.. Nothing! Why doesn't anyone play it on piano, The song is by war and I heard of it on the movie ';Bridge to Terabithia';Why can't I find anything about playing the song ';why can't we be friends'; by ';War'; piano, or find sheet music
Places to buy it:


http://www.sheetmusicdirect.us/search/pr鈥?/a>


http://www.sheetmusicplus.com/pages.html鈥?/a>


http://cgi.ebay.com/ws/eBayISAPI.dll?Vie鈥?/a>


http://search.musicnotes.com/?q=War%26amp;u1=q鈥?/a>








Midi, MP3, etc. and video


http://www.hamienet.com/midi5776.html





This is the best I could find