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When rapper-singer Smino self-released She Already Decided on April 20, he added “Mixtape” in scare quotes to the title on Soundcloud. In doing so, the Saint Louis native provided a sly history lesson for young listeners who’ve only ever referred to full-lengths as “projects.” A decade ago, hip-hop mixtapes provided a way for rappers to skirt record-deal obligations, providing them an unregulated outlet where they could remake the hot tracks of the moment and flex their creative muscles.…