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Bardo Pond was the flagship band of Philly's "Psychedelphia" space rock movement, which also included the likes of Aspera, Asteroid No. 4, the Azusa Plane, and tangentially the Lilys. (check out drugmusic.com for some tastes of psychedelphia).
Explicitly drug-inspired -- their titles were filled with obscure references to psychedelics -- they favored lengthy, deliberate sound explorations filled with all the hallmarks of modern-day space rock: droning guitars, thick distortion, feedback, reverb, and washes of white noise.