Add Level 5 Theme Music

It is Humphrey The Rabbit's interpretation of Holy Diver by Ronny James Dio.
They were playing this song at UCC::Camp on Rockband when I was coding the Rox,
and I immediately knew it was destiny.

It is... not my best work. But it's level 5 so nearly no one will hear it.

It is a heavy metal song which will probably upset my fanbase (ie: sulix)
and it doesn't actually have an electric guitar track (because midi guitar makes me want to cry)
which will probably upset any heavy metal fans (ie: qrqd) who actually get to this level.

This is what HTR is about, upsetting everyone! Equal upsetment opportunities!

Level 6's theme will be titled "Shark Jumper"