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I picked up Is This It again, and oh man, it's just so good. It's like 60's rock in a modern format that can be enjoyed by anyone (age wise). Everything is pretty much fun and upbeat, and the sounds are just so CLEAN. The slight distortion for the singer's voice is a nice touch, and he has such an indie rock kid attitude somewhere inside of it. If you don't look at them as attempting to be an innovation, than you shouldn't have any difficulty enjoying Is This It. It's simple, catchy, clean, upbeat rock and roll revival (maybe) that sounds like a Pavement / (early) Stereolab / Lou Reed / Beatles hybrid.
The vocals are great, as if sung through a megaphone a la "Orange Crush".