A music critic and radio PD from Hankyoreh evaluates music documentaries simultaneously released on Netflix. The Led Zeppelin documentary features interviews with three surviving members—Robert Plant (vocals), Jimmy Page (guitar), and John Paul Jones (bass)—excluding deceased drummer John Bonham. The film's strength lies in previously unreleased archival footage from 1960s Britain during the birth of rock and heavy metal. A standout moment features Jimmy Page personally explaining the sound design of 'Whole Lotta Love,' providing insider knowledge comparable to learning a secret recipe from a master chef. 'Immigrant Song,' a 1972 live performance featured in the documentary, has been so influential that it appears in the opening sequences of films like 'Thor: Ragnarok' and 'The Girl in the Spider's Web.' Meanwhile, BTS's new album completely abandons the signature K-pop sound associated with synchronized choreography. The 14-track album, featuring direct participation from members over thirty years old (excluding youngest member Jungkook), demonstrates a mature musical evolution that diverges sharply from their previous style, marking a significant artistic transformation.