Spotify, the music-streaming service, on Wednesday said it partnered three large programmatic trading platforms--AppNexus, Rubicon Project, and The Trade Desk--to create an online “real-time bidding environment.” The programmatic platforms will allow advertisers to customize their audio spots for listeners in real-time, depending on whether they are commuting, exercising, partying, or just relaxing. Spotify also olled out a global ad-buying feature that allows advertisers to buy 15- and 30-second audio spots that target Spotify’s over 70 million non-paying users. The company will also give advertisers access to demographic data it collects from its users, including their age, gender, location, language, and their playlists.