Note: I am not the creator of this video. This video was originally uploaded on ElectricalEnginerd YouTube channel, but sometime in the past the video was set to private.
Click "Show more" to find .....

...the comments that went with the original upload.
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Featured on EQD Nightly Roundup #775: http://www.equestriadaily.com/2013/09/nightly-roundup-775.html
 
Adapted from a Smile Song MIDI file created by WeimTime
Original Song by Daniel Ingram 
A big thanks to Iris for the OC pony. 
Check out her other art here: http://irishwerewolf-iris.deviantart.com.