Why are people saying that Foxboro Hot Tubs sound like Tom Petty?

Some people are saying that Foxboro Hot Tubs (Green Day's '60s garage rock-inspired side project) sounds like Tom Petty, and they (Foxboro Hot Tubs) are starting to be compared to him (Tom Petty). Why sare they compring them to each other and saying they sound alike? Billie Joe Armstrong sounds like Billie... show more Some people are saying that Foxboro Hot Tubs (Green Day's '60s garage rock-inspired side project) sounds like Tom Petty, and they (Foxboro Hot Tubs) are starting to be compared to him (Tom Petty). Why sare they compring them to each other and saying they sound alike? Billie Joe Armstrong sounds like Billie Joe Armstrong, not Tom Petty, and Tom Petty sounds like Tom Petty, not Billie Joe Armstrong. I just don't get it. Please explain this!
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