I think it might be worthwhile, now that the argumentation over whether Petrucci deserves commemoration in the name of the library, and whether the logo for the project should be the A from the front of Odhecaton, to review some music history.
Specifically, Harmonice Musices Odhecaton was _not_ the first printed book of music. It may have been the first book of polyphonic music to be printed without separate wood-block inserts. Its claim to fame is definitely that it is the first book of polyphonic music printed using movable type!
This places it besides the Gutenberg Bible in importance. Before the GB and HMO, books of music were either entirely made of woodcuts, or (between GB and HMO) printed with movable type, but with spaces left for wood-cut impressions of the music.
There are other features of the Petrucci prints worthy of praise: multiple impressions with amazing alignment, which allowed staves without breaks in the lines, the beauty of the fonts he used, the quality of the editing, etc. But the main thing that sets HMO apart from the rest of printed music over the centuries is that it was the first printed with movable type.
Likewise, I find statements like "IMSLP Christmas Cards are now available featuring designs from the Harmonice Musices Odhecaton , the earliest-ever printed polyphonic music, published by Petrucci in 1501" (Philidor's Christmas card announcement, Aug 25, 2011) [plenty of polyphonic music was printed before 1501, but not using movable type!] and " ", i.e., the general lack of any mention of the historical importance of HMO on its own page or on the portal (which doesn't even have the A logo by the link to the library!)
Finally, a pet peeve, since I've been championing HMO for decades, is the low-resolution and poor quality of the facsimile that is actually provided. Maybe this is the best that can be done because the few libraries with copies are so uptight over controlling their non-existent publishing rights, but can't someone get close enough to one to make a higher-resolution set of scans?