Targeted advertising isn't a new concept, and Spotify is looking to examine your playlist habits before serving up those messages. The streaming service offers a library of curated mixes based on genre and mood, and eager advertisers can now leverage a listener's state of mind to sell their products. Playlist Targeting is the official name of the feature, with collections of tracks for Chill, Party, Workout, Romance, Sleep and more providing the opportunity for brands to woo would-be customers. Spotify says 41 of its top 100 playlists are context related (like the mood options), and users spend an average of nearly 2.5 hours listening a day. That's a lot of time for Trojan ads during the Bedroom Jams playlist.