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Their sonic range can go anywhere from mellow, feel-good acoustics to strained vocals over hard-hitting electric guitar riffs.

These are meant to be the anesthetizing accompaniment to playlists featuring purveyors of sonic wallpaper made to help your whole body chill out — a vibe-fest, on demand.

That includes the "sonic experimeentation" of Faithless, a film soundtrack to a movie that never got made.

For here, everything was slightly abstracted — a sonic hum gave way to a hazy mixture of lights as I glanced at various ideas and impressions.

Pearl Jam’s guitarist Stone Gossard called the show a “sonic concussion.”