Electronic music’s jack-of-all-trades Luke Vibert just dropped a free mix taking us all back to the roots of old-school, hardcore UK rap music. The hour-plus DJ set focuses on choice jams from the British rap scene from 1988 to 1992, but good luck deciphering who’s who in Vibert’s mix. In fact, as an added bonus, fans can try to arrange the mixed-up tracklist into its correct order—and win a special prize from Planet Mu if they figure it out. Check out the vintage tunes and contest info on the Planet Mu blog here.