This question was posed by my old friend Jeremy, and it's a good one: Are The Clash a punk rock band?
My answer: No. To me, they're too diverse. If you listen to "I Fought The Law", "Train In Vain", "Straight To Hell", and "Rock The Casbah", they're four totally different songs.
It seems to me(given my limited punk experience) that the true punk rock bands like Iggy and The Stooges and MC5 have a sound and stick to it,but are also basically credited with inventing that sound.
Then again, that's just my opinion.