iLike’s new developer platform allows you easily add full-track streaming music to any web site without difficult engineering. (See coverage on TechCrunch and CNet.)

You don’t have to upload any tracks, the music comes from major labels, and it’s all legal.

there’s an interesting twist to iLike’s platform: it’s specifically focused on making iLike playlists available and openly collaborative. That’s evident in the list of launch partners: the forthcoming Connected Weddings application on Facebook, for example, will let wedding guests add to a suggested song playlist; the Flixster movies application will use iLike’s API to let members build movie soundtracks to accompany the film’s page in the Flixster directory; the set of TV-fan apps built by Watercooler will let fans also construct the soundtrack that played in the background in any episode of a given TV show. Other partners include Classtop.com, the Social Gaming Network’s Free Gifts application, Slide’s FunSpace, Jambool, Mesmo.com, and Zimride’s Carpools application.

The partners don’t end with social applications, either: IAC’s Evite will be using iLike’s API for a “playlist” tab on each invitation, so that guests can build a party soundtrack, and both TypePad and Google have built embeddable blog widgets to incorporate music.