Storybeat - Storybeat app comes up with features to help you in changing the background music of your videos in a few simple steps to share your favorite moments with your social media friends.
last-slack - Display your scrobbled tracks from last.fm in Slack
Wiggle - Make Awesome Selfie Music Videos
Owlead - Grow your Twitter with valuable followers, effortless
Triller - Make celebrity-quality videos with a few taps of your phone
Sound Control - App-specific volume control