"American pop-punk vocalists like Billie Joe Armstrong of Green Day took on a British-tinged accent to sound more like seminal artists such as Joe Strummer of the Clash. "
What? He doesn't sound English (or "British", whatever that means) to me. One main difference that I notice between American and English accents is the pronounciation of "t" in the middle of a word. Billie Joe Armstrong says "phodergraph" - an English person would say "photograph".
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