Music on Vine - Vine, now with music. Make 6-second music videos.
Type2phone - Type2Phone: Use your Mac as keyboard for iOS devices
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.
1keyboard - Type on your iPhone, iPad or AppleTV using your Mac keyboard
Wiggle - Make Awesome Selfie Music Videos
Mocha Keyboard - Mocha Keyboard is a leading Bluetooth keyboard application for iPad, iPhone, and iPod touch.