Mike Garrett
Mike Garrett reviewedDaily FireA Slack app for every music lover
 RecommendedPros: 

Does a damn good job without everyone needing their own account.

Cons: 

Only supports single tracks right now, but that's easy to get used to.

We installed this a couple weeks ago on the Rdio Lovers Slack (https://rdioloversslackin.herokuapp.com/) in the Found New Music This Week channel (https://app.daily-fire.com/groups/3acnij/fnmtw). It tracks individual contributions and provides playlists in Youtube and Spotify which makes it much more accessible to those outside the Spotify community.

Mike Garrett has used this product for one week.