Here’s one of many local archeological gems: Tribal Music’s Do The Math, from 1996, is an appropriate start, with collegiate cover, that is an essential part of any Seattle musical education. Damn is this record great.

This compilation was primarily compiled and produced by Vitamin D. It also features several cuts from his underappreciated supergroup, Ghetto Chilldren. Tribal Music was an important ’90s label that we should thank for cataloging our city’s golden boom-bap era, all those jazz samples and scratching, at a time when Seattle was awash in grunge hangover. Do The Math arrow-points to the origins of our uniquely laid-back upper-left sound, summarizing the underground roots of today’s scene. You can find this record for free on Bandcamp. If you have any interest or involvement in local hip-hop, you owe it to the many Duwamish ghosts to go listen to this today. The cover photo was taken by Diana Adams of Vermillion fame.

Here’s another take:

The giant that all Northwest acts have had to measure up to: The Do The Math compilation. Sounding only marginally more professional than their earlier tapes, the Tribal artists deliver with track after track of murky, jazzidelic perfection. Vitamin D and DJ Topspin are the obvious stars of the show, setting the gray, rainy tone for an expanded array of talent to rhyme over. Phat Mob, Ghetto Children, Sinsemilla, Union of Opposites, and the rest of the Tribal family are joined by such artists as the Silent Lamb’s Silas Blak, Source of Labor’s Wordsayer, and the Elevators’ Specs, rounding out the sound more than on Untranslated Prescriptions. I kid you not; this is a heavy release. To put it into perspective, this is to Seattle what the Project Blowed comp is to LA. (This review originally appeared on the Bring That Beat Back blog and was written by Jack Devo.)