also: プログレッシヴロック
noun
progressive rock
A genre of rock music that emerged in the late 1960s, characterized by complex compositions, experimental instrumentation, and conceptual themes.
キング・クリムゾンはプログレッシブ・ロックの代表的なバンドだ。
King Crimson is a representative progressive rock band.
彼はプログレッシブ・ロック
He is drawn to the odd time signatures of progressive rock.