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2020 was a rollercoaster year for TikTok. A constantly changing deadline from the Trump administration meant the company spent most of the year unsure of it would still be around to see the end of it.

Capping off its most notable year to date, short-form video app TikTok — whose fast-growing hit-maker clout has been a defining story in 2020’s quarantined music industry — released its first music ...