Behind the MusicA music site's uploading tool cranks up the sales volume to get things rocking and rolling.

Dave Stack traded a dotcom gig for the music biz when he openedan online music marketplace,MusicStack, and tuned up the buying and sellingtechnology behind the music.

MusicStack is a collection of record stores, all competing onprice and selection, offering both new and used music."Worrying about fresh inventory is not a problem," saysStack of his $5 million business. An uploading function updatessite selections in real time and allows the site's 3,000sellers to manage their own wares.