While many of Metalheadz earlier anniversary releases that landed this week are great, this latest three-decade celebrator is an ultra-special rarity. 'Back To School' comprises three sonic celebrations of breakbeat culture, homing in on several artists (The 4 Hero-related Tek 9, Goldie's inaugural project Rufige Kru and Stretch & Enjoy) who helped to define the genre before it even became defined as drum & bass proper. Lower-tempo breaks, orchestral stabs, crude FM wobbles, ragga radio samples, resampled rewinds, and soul vocal shouts all make up this happily retro release.