Try visiting
http://query.yahooapis.com/v1/public/yql?format=xml&q=select+*+from+music.video.search+where+keyword%3D%27elvis%27Video info should look like :
[code]
<Video copyrightYear="2002" duration="199" explicit="0" flags="1" id="2155558" label="Yahoo!" localOnly="0" rating="-1" rights="1" title="Elvis Greatest Hits" typeID="16"url="http://new.music.yahoo.com/videos/--2155558"><Image size="50" url="http://d.yimg.com/ec/image/v1/video/2155558?size=50"/><Image size="73" url="http://d.yimg.com/ec/image/v1/video/2155558?size=73"/><Image size="100" url="http://d.yimg.com/ec/image/v1/video/2155558?size=100"/><Image size="130" url="http://d.yimg.com/ec/image/v1/video/2155558?size=130"/><Image size="146" url="http://d.yimg.com/ec/image/v1/video/2155558?size=146"/><Image size="206" url="http://d.yimg.com/ec/image/v1/video/2155558?size=206"/><Image size="300" url="http://d.yimg.com/ec/image/v1/video/2155558?size=300"/><Image size="385" url="http://d.yimg.com/ec/image/v1/video/2155558?size=385"/><Artist catzillaID="0" flags="124419" hotzillaID="1800038875" id="261721" name="Elvis Presley" rating="-1" trackCount="20618" url="http://new.music.yahoo.com/elvis-presley/"website="http://www.elvis.com"/><Category id="7318647" name="Pop" rating="-1" type="Genre"/><Category id="7318650" name="Rock" rating="-1" type="Genre"/></Video>
[/code]
The URL http://new.music.yahoo.com/videos/--2155558 is invalid!