Long Term Project: Edition Zefiro

I'm developing an ecommerce website for a client.  It is called edition-zefiro.com and it sells digital and hard copies of sheet music.  It's quite specialised with a focus on early music.  I'm exploring ways of making use of what is called the semantic web.  The likes of google and microsoft are very helpful in teaching us to inform their technologies with an articulacy that their tech. can understand.