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Moooodify is a website which lets you sort your favourite Spotify music by different moods, and then save them as playlists. It was created using the Spotify Web API to sort the songs by moods and display them. It also has a tool where you can apply your own custom moods in case you aren't feeling like any of the pre-generated ones. The AJAX calls are made in the same order to fetch the tracks, their album art, and audio features.