Which music streaming analytics metric is known as the 'golden measure' that most directly correlates with a track's commercial success and algorithm promotion?

The music industry has been revolutionized by streaming platforms that collect massive amounts of data on listener habits. This data powers recommendation engines, helps artists understand their audiences, and shapes marketing strategies. But how much do you know about the analytics that drive today's music business? Test your knowledge about the data science behind your favorite tunes!

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Save rate (percentage of listeners who save a track to their library)
Completion rate (percentage of listeners who finish the entire track)
First 30-second retention (listeners who continue past the first 30 seconds)
Share velocity (how quickly a track is shared in the first 24 hours)