“In 2006, a New England Conservatory student named Edward Guo founded the online portal IMSLP, or International Music Score Library, a kind of Wikipedia for musicians. Now the site contains some 350,000 scores and 40,000 recordings from 14,000 composers. The works of composers who have been dead for less than 70 years are not in the public domain and don’t appear on the site. Still, IMSLP is omnipresent enough that I’ve encountered music students who assumed there were no scores to Strauss songs at all, since they weren’t showing up there.”