At this time our team cannot retrieve or show YouTube playlists for artists that have never charted on charts.youtube.com - this is a limitation that is out of our control and comes from YouTube.
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The only artists that we can show YouTube playlist adds for our artists that have charted on charts.youtube.com
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If your artist does not appear in search on charts.youtube.com we will not be able to show their playlist adds. This is a separate site to youtube.com and music.youtube.com