Playlist Organizer — Sort Spotify Playlists by Tempo, Key & Energy

A tool to sort Spotify playlists by BPM, musical key, and energy for smoother flow — built for house parties, workouts, and DJ prep. Uses a hybrid analysis pipeline: SoundNet API as primary source, with iTunes Search API + Librosa (Python) as fallback for local audio analysis. Features an Energy Canvas where users can draw custom energy curves, Camelot key notation for harmonic mixing, selective re-analysis, and manual reordering. Built to solve the problem of playlists that kill the vibe with awkward BPM jumps and energy drops.