DrSentenial, who has shared music with the site before, is a very talented guy who makes pony piano tutorials. They are a fantastic resource if you are looking for something new to play on your keyboard!
DrSentenial has a new series of videos that he has shared with us: Making Cupcakes, Pinkie's Singing Telegram, the Welcome Song, and Ballad of the Crystal Empire. DrSentenial's Youtube channel also has videos of him just playing the songs without the tutorials. Even if you're not a pianist, you should still give them a watch. They are well done!
Everypony probably has seen by now that there was a new song this morning. There will be more on that a bit later today.