To the best of my knowledge, Obrasso Music are already doing this. I've bought a few pieces recently that have included Bass Trombone parts in both bass and treble clef. Seems like quite a good idea to me..... Dave -- wax-recording.com, simply the best, most cost-effective and least stressful route to recording an album. eBay, the world's largest on-line market place, http://www.ebay.co.uk