Lemme see...I have 30,000 78's, or about 180,000 minutes of music (3000 hours, or 125 days or 4 months of it). Since this is all mono, how many of these "blu-ray" DVD's would I need to store a houseful of shellac? Save a lot of space, but not near as much fun to play... Steven C. Barr (wonder how they'd work with Royal Blue Columbias?)