Last fall, Twitter bought We Are Hunted, a “music discovery” startup that made a popular app for Spotify. Apparently Spotify is paying attention: It just bought Tunigo, another music discovery startup with a popular Spotify app. Spotify isn’t announcing terms for the deal, but says that all of the Swedish company’s 20 or so employees will come to work at Spotify’s offices in Stockholm and New York. The Tunigo Spotify app will keep running (there’s also an iPhone app), but presumably Spotify’s new hires will be put to work on Spotify’s main service, which has 24 million users and six million paying subscribers. Tunigo had reportedly raised $3 million. The We Are Hunted and Tunigo deals aren’t exactly parallel, since Twitter used We Are Hunted to build a brand-new music app, and Spotify doesn’t need one of those.