NY Times: “Hoping to Move Guitar Notations Into The Legal Sunshine“:
” . . . about 2 percent of the songs in the company’s catalog have licensed guitar tablature associated with them.
For the remaining songs in Famous Music’s catalog — and the vast majority of the music publishing industry’s collective catalog — there is insufficient demand to justify the costs of publishing tablature.
As a result, guitarists who want to know how to play less mainstream songs have gone to sites where amateurs post tablature. Under this agreement, MusicNotes, publishers and artists will essentially earn money from an army of volunteers, who are creating content that the publishers are not creating on their own.”