I only know a few classical pieces, but this hands down is my favourite:
[video="youtube;QxHkLdQy5f0"]https://www.youtube.com/watch?v=QxHkLdQy5f0[/video]
I actually discovered it through the old popular DS game "Nintendogs" in which your dogs could find records and bring them back to you...I would always play this one cause I loved the dance they did haha.
It's a really lovely song.