Preview by downloading this animated gif. Actual bootanimation is high res, of course, animated gif quality is for the sake of preview file size...you guys get the idea. Animation ends after the beats portion, the preview loops.
Credit to charlieb620 for extracting the Beats by Dr. Dre Bootanimation.
Credit to mexxxico for the Black HTC Bootanimation.
Credit to ptruman for the Retrograde Sensation Bootanimation.