Assertion: sill | /r/HasProperty | omnipresent force
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text: Sill was an omnipresent force in the development of West Coast R&B and rock & roll, shepherding the fledgling career of the influential songwriting team of Jerry Leiber and Mike Stoller before teaming with the legendary producer Phil Spector to found Philles Records, the premier U.S. pop label of the early '60s.