A pony fan who goes by Arvianth on Youtube shared three great videos with Everypony Sings. Two are orchestral covers, and one is an original/remix about Chrysalis.
You can listen to the orchestral version of B.B.B.F.F. in the video at left. Then surf over to Youtube to hear an orchestral version of Giggle at the Ghosty. Both are very well done and a lot of fun to listen to.
Lastly, you can listen to Deceptive Cadence, the original song inspired by Chrysalis. Thanks to Arvianth for sharing these songs!