Amazon has built itself up as Netflix and Hulu’s biggest competitor in online video subscriptions, but now it’s looking to bring the fight to Spotify, Google, and Apple for music. Those companies all offer $10-a-month subscriptions. Recode reports that, unsurprisingly, Amazon is planning on introducing its own plan with similar pricing as soon as September. More interesting, however, is rumored a second $4 or $5 plan. It will offer unlimited music too. The catch is you can only play it on Amazon Echo hardware – no PCs, no tablets, no smartphones. If true, it’s ridiculous – not only does pretty much everyone listen to…

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