When practicing your undulations be very aware of your lower back, and control the flow before letting yourself duck-tail. When twisting be sure to maintain neutral pelvis, lift the chest and breathe to avoid cramps. The "hungry-hungry-hippos" step should link the foot and the chest lifting together.
Here’s the article on my site with suggestions on where to get music to practice to, and what sort of CDs might make good starters. If you hear something you like in class I am always happy to write down the song and artist for you, too ^_^. Music is really important for bellydance, since it is the music made visible. Each dancer expresses how she hears the music in her own way, and I teach more about what to listen for in the songs in level two. The wonderful thing about this is, if you pick a musically interesting song you don't have to worry about your dance being interesting or not, because the composer will have done that work for you ^_~
On the topic of Practicing, Nadira Jamal of Boston has some great tips in her micro-articles "Do I Have to Practice" and "How to Practice When You Only Have 5 Minutes"
Bellydancers are still finding more ways to bring the music to life, including this fusion prop, called a fan veil. This isn extra large version created for the dancer in the clip, Victoria Teel.
When the music is a fusion, the dance should be as well. Likewise, if the dance is a fusion, the music should include the same elements.