Katy Perry, ‘Prism’ (Virgin EMI) Effervescent pop queen Katy Perry’s last album, “Teenage Dream” (2010), was a runaway hit, generating five No. 1 singles and placing her giddy singing career on terra firma. Perry’s fourth studio album, “Prism,” will likely be another big winner. “Roar,” a song of empowerment that references her painful, text-message breakup and subsequent…
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