Check out Launching iMessage on Spotify by JR. Here is an excerpt:
This week, a project me and my friends here in San Francisco have been working on finally went live. The Spotify iMessage App Extension.
This app extension let’s you search for songs, send them to friends, and then play short 30 sec clips.
I know it doesn’t look like much – but it was a lot of…
The full article is available here.