Page "The Charlatans (American band)" Paragraph 3

Another reason that the Charlatans ' extended stay at the Red Dog Saloon was important was that, immediately before their first performance at the club, the band members took LSD.

As a result, the Charlatans are sometimes called the first acid rock band, although their sound is not representative of the feedback-drenched, improvisational music that would later come to define acid rock.