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Chicagoan Allegra Rosenberg, 17, has become a YouTube sensation, writing songs beloved by fans of Doctor Who, BBC Sherlock and other off-beat pop culture hits. We revist Jay Shefsky's profile. Watch music videos.
Chicagoan Allegra Rosenberg, 17, has become a YouTube sensation, writing songs beloved by fans of Doctor Who, BBC Sherlock and other off-beat pop culture hits. Jay Shefsky has a profile.
 

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