Which customer analytics metric is MOST crucial for music streaming platforms when determining artist royalty payments?

Streaming platforms have revolutionized how music labels track customer behavior and make business decisions. Analytics now drive everything from artist promotion to concert planning. But how well do you understand the data systems powering today's music business? Test your knowledge of music retail customer analytics with this challenging question!

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Stream completion rate (percentage of tracks played to completion)
Stream count (total number of times a track was played beyond 30 seconds)
Social sharing rate (how often tracks are shared to social platforms)
Playlist addition frequency (how often tracks are added to user playlists)