Though the Sex Pistols blazed the trail for late-70s British punk-rock, The Clash came to represent a more musically and lyrically adventurous style. 1979’s London Calling album marked a change in musical direction for the band, featuring a broader palette of styles, including reggae, ska, jazz and hard rock – more post-punk than punk, then. And, in keeping with the more experimental vibe, the title track that we’re looking at here features a lot more than mere thrashed out powerchords – in particular, its unconventional Phrygian modal tonality.