Count Artist Occurrences On Spotify Ranking List

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Example Testcases:

{"headers":{"Spotify":["id","track_name","artist"]},"rows":{"Spotify":[[303651,"Heart Won't Forget","Ed Sheeran"],[1046089,"Shape of you","Sia"],[33445,"I'm the one","DJ Khalid"],[811266,"Young Dumb & Broke","DJ Khalid"],[505727,"Happier","Ed Sheeran"]]}}