title:   1875 In the Hall Of The Mountain King by Edvard Grieg
source:  https://en.wikipedia.org/wiki/File:Musopen_-_In_the_Hall_Of_The_Mountain_King.ogg
license: public domain


title:   1890 Clair de Lune by Claude Debussy performed by Laurens Goedhart
         “Moonlight,” in Suite bergamasque, 1890–1905
source:  en.wikipedia.org/wiki/File:Clair_de_lune_(Claude_Debussy)_Suite_bergamasque.ogg
license: creativecommons.org/licenses/by-nd/3.0/
modifed: re-encoded to reduce filesize


title:   1902 Scott Joplin - The Entertainer
source:  freemusicarchive.org/music/Scott_Joplin/Frog_Legs_Ragtime_Era_Favorites/04_-_scott_joplin_-_the_entertainer
license: public domain