I've got a list of about 15 but my embed is giving me a hard time so I'll just throw the links in here. Tried to give some variety of new, old, well-known, and backpack.
http://www.youtube.com/watch?v=CZv-W4x0Fqw
http://www.youtube.com/watch?v=jjmiLp47Yg8
http://www.youtube.com/watch?v=n2cyyO3NPl8
http://www.youtube.com/watch?v=REsaKAWKjJk
http://www.youtube.com/watch?v=Tc3DPvbmJTo
http://www.youtube.com/watch?v=AmpAN1c1ivY
http://www.youtube.com/watch?v=DHyqs0PoBgE
http://www.youtube.com/watch?v=tYdeKTOyh8c
http://www.youtube.com/watch?v=TfRFbQSlq6A
http://www.youtube.com/watch?v=1JlZRd8TSc8
http://www.youtube.com/watch?v=m7G-ucUPxoc
http://www.youtube.com/watch?v=DTFEIG12UJw
http://www.youtube.com/watch?v=ewc1hixzYPY
http://www.youtube.com/watch?v=0fg08Hjwdo0
http://www.youtube.com/watch?v=-dyPeGDeS3o
http://www.youtube.com/watch?v=gVeXbOWSF7E