In my interaction design class, we were tasked to add a new feature to an existing digital product. I'm a hardcore user/fanboy of Spotify and their data analysis systems, and this seemed like a perfect opportunity to utilize these systems to conceptualize a new functionality.
Spotify is constantly keeping track of your listening data. 
This is a controversial issue, where some users feel that their privacy is violated. However, I see this as an interesting opportunity for statistical data such as BPM to be utilized.
What is BPM? 
Beats per minute, or BPM, indicates the number of beats in one minute. For instance, a tempo notated as 60 BPM would mean that a beat sounds exactly once per second. A 120 BPM tempo would be twice as fast, with two beats per second.
Some examples of my listening data over the years.
Introducing: BPM On Spotify
With BPM On Spotify, users can create a personalized BPM-based playlist where they choose a specified BPM and genre(s). Spotify uses its curation systems to build that playlist.
In addition, users can also view a song's BPM number, as well as the average BPM of a playlist or song. The video below goes into more detail.
Curious on my process? Check out this project's process document here.

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