I would suggest ambient or classical music... or just music that you like or that puts you in a good mood. Any negative music, and you may have bad dreams... just my experience. Music, if played real softly as I fall asleep has helped me achieve the (WILD?) technique -where you enter lucidity immediately upon entering dreamland... To do this, I have focused on the tones or rhythms while also being aware of my body from head to toe, (think of youe toes or wiggle them, then move up your body to the top of your head, and do this back and forth while falling asleep -while still remaining conscious...)