Manager Troy Carter helped shepherd the career of Lady Gaga, and he's working with new client John Legend heading into the R&B singer's next album. But Carter's company, Atom Factory, also has its eye on the generation of self-made YouTube stars, such as Greyson Chance, whom Carter signed in 2010. Now comes Lindsey Stirling, the dubstep violinist with more than 2 million YouTube subscribers, a sold-out European tour and 108,000 copies sold of her self-titled, self-released debut since its release last fall, according to Nielsen SoundScan.

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