What is the current number of people streaming songs on Spotify?

This question pertains to market sizing or estimation, a common topic in interviews with consulting firms, technology companies, or startups. These questions are intended to assess a candidate's logical reasoning, deductive skills, and problem-solving abilities. In this scenario, the interviewer is prompting you to demonstrate your critical thinking by making an informed guess about the current number of individuals listening to songs on Spotify. To formulate your response, you should attempt to create a rough estimate using the following information or assumptions: The overall number of Spotify users. The geographical distribution of Spotify users by location or time zone. The typical usage behavior of Spotify users (for instance, when they are most likely to be listening throughout the day). The specific day and time of the interview may also influence your estimation.

To address this question, I would start by considering the total number of active users on Spotify, which was approximately 380 million at the end of 2021. Since we’re focusing on real-time listeners, it’s important to take into account the global distribution of these users and their typical usage patterns. As Spotify has a worldwide presence, we need to factor in different time zones. For example, if it’s nighttime in Asia while it’s daytime in Europe and America, we can reasonably assume that many users in Asia are likely inactive, whereas a larger number in Europe and America might be active. Assuming that about 25% of users are active at any given time, this would correspond to around 95 million users. Nonetheless, we cannot assume that all active users are listening to music, as some might be utilizing other features of the app. If we estimate that only 70% are actually listening to music at any given moment, that would yield approximately 66.5 million users. This, of course, is a rough estimate based on the data available and certain assumptions made.

Globally, Spotify has approximately 380 million users, who are spread across various countries spanning all time zones. For the sake of this analysis, let's assume these users are evenly distributed among the time zones. On an average weekday, if it’s midday in Europe, Asia would be mostly asleep while America is just starting to wake up. I estimate that around 15% of European users are using Spotify at work or during their lunch break, about 5% of American users are listening as they wake up, and only about 1% of Asian users would be active at this time. Taking into account the differing population densities across continents, and considering each has a roughly comparable share of the Spotify market, we can infer that about 7% (the average of our estimates) of Spotify's total user base is likely listening to music at any given moment. Thus, my estimation suggests that approximately 26.6 million people (7% of 380 million) are currently streaming songs on Spotify.