From 1931 -  Lyrics by Gus Kahn and music by Fabian Andre and Wilbur Schwandt. 

Artwork by order of appearance: 

Reach for the Stars By Duskie-06 - https://www.deviantart.com/duskie-06/art/Reach-for-the-Stars-Updated-629651990

Luna's Night By DVixie - https://www.deviantart.com/dvixie/art/Luna-s-Night-545502201

A night with Nightmare Moon By Margony - https://www.deviantart.com/margony/art/A-night-with-Nightmare-Moon-763088029

Ocean Of Dreams By JoelletheNose - https://www.deviantart.com/joellethenose/art/Ocean-Of-Dreams-658558149

Luna By YanisFucker - https://www.deviantart.com/yanisfucker/art/Luna-553693251

Princess Luna Military Portrait By AssasinMonkey - https://www.deviantart.com/assasinmonkey/art/Princess-Luna-Military-Portrait-531836464

Princess Luna By Dawnf1re - https://www.deviantart.com/dawnf1re/art/Princess-Luna-283114452

Princess Luna By SnowSky-S - https://www.deviantart.com/snowsky-s/art/Princess-Luna-444007864

Princess Luna Close Up By viwrastupr - https://www.deviantart.com/viwrastupr/art/Princess-Luna-Close-Up-666523070

Princess Luna Dress By Dalagar - https://www.deviantart.com/dalagar/art/Princess-Luna-Dress-439732743

Princess Luna (draw this again) By LuminousDazzle - https://www.deviantart.com/luminousdazzle/art/Princess-Luna-draw-this-again-733431725

Princess Luna By The-Keyblade-Pony - https://www.deviantart.com/the-keyblade-pony/art/Princess-Luna-485686932

Restless Nights By Huussii - https://www.deviantart.com/huussii/art/Restless-Nights-553754053

Luna's Lake By ABluSkittle - https://www.deviantart.com/abluskittle/art/Luna-s-Lake-493945925

Luna Portrait By blueSpaceling - https://www.deviantart.com/bluespaceling/art/Luna-Portrait-636512534