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Except that Stone Temple Pilots were a band that formed in 1985 in Los Angeles, years before Pearl Jam ever recorded anything, and then released a "little similar" sounding album a little over a year after Pearl Jam released Ten. In a world previously ruled by hair bands where I wouldn't expect STP to have sounded anything like they did when they put out their debut, I find that a little odd.
Especially considering that this is what they sounded like before Core: