US music critic Tom Hibbert explains "underground" as having originated in the 1960s in anti-establishment culture and says it describes the use of music or art to protest against existing culture and commercial values.
美國樂評人 TomHibbert 解釋「地下」一詞最早出現在六○年代，是屬於年輕人的一種反動文化，以音樂或藝術的形式，來表達他們對既存文化形式與商業價值的抗拒。