Define success metrics for Music serving free listeners

Problem Statement Description

Product context: Spotify is an audio streaming company; its products include music, podcasts, audiobooks, playlists, recommendations, creator tools, subscriptions, and ads.

Spotify’s Music experience serves a large global audience of free listeners who discover, stream, save, and share music while encountering product limits and advertising. These users may be new to streaming, casual listeners, price-sensitive users, or future premium subscribers, and their experience must balance listening satisfaction, discovery, retention, creator value, and ad-supported monetization.

In this metrics interview, define how you would measure success for Spotify Music specifically for free listeners. Focus on building a useful metric framework rather than proposing product changes. Your answer should clarify what “success” means for this segment, how metrics should be calculated, and how Spotify could use them to make product and business decisions.

The experience should consider:

- The core user journey for free music listeners, from discovery to playback, repeat usage, and potential upgrade intent

- Clear metric definitions, including numerator, denominator, time window, and unit of analysis

- Segmentation by listener cohort, market, platform, tenure, listening intent, and ad exposure

- Instrumentation needed across search, recommendations, playlists, playback, skips, saves, ads, and session behavior

- Guardrail metrics that protect user trust, creator outcomes, ad quality, and long-term retention

- How to distinguish short-term engagement from durable satisfaction and habit formation

- How free-tier metrics should inform decisions across personalization, monetization, and premium conversion

The goal is to present a practical success measurement approach that would help Spotify evaluate whether the free Music experience is valuable for listeners, sustainable for the business, and healthy for the broader music ecosystem.