Get to your Bearshare download folder & find the songs. One technique is to drag & drop the songs onto the Library icon at the top of the playlists in iTunes. Hold SHIFT key as you select them so you can select multiple song files at one time. iTunes won't re-import the same song twice so long as all details are the same.

More details here iTunes Tutorial: http://www.apple.com/support/itunes/...ial/index.html