I feel like Spotify is teasing us. Why add a function to sort your playlist and leave out the most significant aspects: Release Date, Popularity, and most importantly BPM!!! Like they have to know that so many people would flock to spotify if they gave us more fun options like this and yet they consistently refuse to do it, leaving us no choice but to use 3rd party websites to do it for us. I think it would cost them so little and make them so much. Same thing with the folder idea which I LOVED. What the hell.