官網介紹:
Musopen (www.musopen.org) is a 501(c)(3) non-profit focused on improving access and exposure to music by creating free resources and educational materials. We provide recordings, sheet music, and textbooks to the public for free, without copyright restrictions. Put simply, our mission is to set music free.
推薦原因:大量的免費古典樂及樂譜下載，也有線上收聽古典樂的服務。
缺點是廣告有點多，視覺上有點複雜。