In their study, Middlebrook and Sheik used the Spotify Web API to collect data for 1.8 million songs, which included features such as a song's tempo, key, valence, etc. They then also collected approximately 30 years worth of data from the Billboard Hot 100 chart.This code can be exchanged for an access_token through the Spotify Accounts API. This could be performed directly inside of your iOS, Android, or static web apps and will work as intended - but it is extremely insecure as it exposes your client secret to the world. This should never be done for production apps, ever.
When you copy the URI from Spotify it will look something like: spotify:playlist:5huIma0YU4iusLcT2reVEU. However, to actually get it to work on the API you need to add spotify:user: to the beginning of the above. This applies even to public playlists and, yes, it means that you are saying spotify twice.
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