Tango is a leading messaging app with over 250 million registered members and over 70 million monthly active users. Back in July they gave an accidental preview to some tech bloggers about a new app called Tango Music Pix. Today they officially unveiled the app for iOS and Android allowing you to create a slideshow of pics with a micro-licensed backing song provided through Rumblefish. Tango's been finding ways to include music on its messaging platform from a partnership with Spotify to music channels. Though messaging with music hasn't taken off to date, shooting video clips or photos and adding...

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