However, I'd like to thank all the hiphop artists out there who begin every track with their MC deadpanning, "Yo. Yo. Huh. Yo." It's good to have that fast indicator that I can hit Next without listening to more than five seconds of the song.
(There is hiphop that I enjoy, but if your level of lyrical creativity is such that your song begins with "Yo", then I'm sorry but we're done here.)
Almost as useful an indicator is the Black Metal Growl, though sadly, they sometimes wait until 20 seconds into the song to unleash that nonsense.