What metrics would you focus on as the PM for Spotify?

In this question, concentrate on identifying key performance indicators that align with Spotify's business goals, such as user engagement, retention, and revenue growth. Discuss metrics like Monthly Active Users (MAU), Average Revenue Per User (ARPU), churn rate, and user session length. Consider how these metrics can inform product decisions and drive improvements in user experience. Additionally, think about how you would segment these metrics by demographics or user behavior to gain deeper insights. Be prepared to justify your choices and explain how they connect to Spotify's strategic objectives.