Some of the best thrills of the Internet music revolution is the ability to find extremely rare music with great ease. But even with such vast archives to draw from, quite a lot of great songs have gone undiscovered for nearly half a century – particularly in genres that lacked hifalutin arty pretense. Previously, only the most extremely dedicated and passionate record collectors had the stamina and prowess to hunt down long forgotten wonders in dusty record bins – often hoarding them in private collections, or selling at ridiculous collector's prices.

Legendary compilations like Nuggets, Pebbles, ad nauseum, have exhausted the mines of early garage rock and proto-punk, keeping alive a large cross-section of underground ephemera. However, few have delved into and expertly archived the wealth of proto-metal, pre-stoner rock tracks collected on Brown Acid: The Second Trip. Lance Barresi, co-owner of L.A./Chicago retailer Permanent Records has shown incredible persistence in tracking down a stellar collection of rare singles from the 60s and 70s for the growing compilation series. Partnered with Daniel Hall of RidingEasy Records, the two have assembled a selection of songs that's hard to believe have remained unheard for so long.

Brown Acid: The Second Trip opens with the squealing guitar harmonies and Sabbath plod of Ash‘s "Midnight Wish." Sweet Crystal‘s "Warlords" is a fuzzy and fierce Deep Purple/Arthur Brown inspired organ-led anthem. Raving Maniac‘s ‘Rock and Roll Man" is a tight and brash glam-meets-metal tune proving the true potential of a genre later squandered on Sunset Strip poodleheads. "Silence of the Morning" by Glass Sun serves grungy psych while the Volt Rush Band merges MC5 frantic energy with razor-sharp guitar leads. And, Iron Knowledge‘s aptly titled "Show Stopper" features a breakbeat and incredibly infectious detuned bass warble motif that DJs would kill for – had anyone been able to find the tune back in the day.

Throughout, The Second Trip is yet another wall-to-wall set of blazing tracks that feels like you've uncovered a holy grail. And, in a way, you have.