Node used or open box.... to get the music from your computer to the node I just copy it to a USB thumb drive or a large "backup" drive and plug it into the Bluesound (Playlists in the root directory). You will then have easy, fast access to all your music. Or you could set up an NAS, but that seems like a bit of work.
However, the real beauty is access to high quality music from Tidal, Qobuz and Amazon (also others like Paradise Radio).