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In page Payola:

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One side effect of the vagueness of the law[citation needed] and the creation of the loophole[citation needed] is the expansion of the concept at the hands of online music sharing websites. In 2009, the website Jango created a plan to accept promotion fees legally by disclosing that they are paid to play the songs. "For as little as $30, a band can buy 1,000 plays on the music-streaming service, slotted in between established artists. The artists themselves choose what other music they'd like to be played next to."[3]