Silicon Still Rocks the House Online music downloading might be the new wave in the music business, but it won't crest for at least another five years, according to a new report. &lt;FONT face="verdana,MS Sans Serif,arial,helvetica" size="-2"\ color="#666666"&gt;&lt;B&gt;-washingtonpost.com&lt;/B&gt;&lt;/FONT&gt;