Bandlab - Capture, nurture, and collaborate on song ideas in the cloud
Music Memos by Apple - An app to capture your song ideas
Amper Music - Artificial intelligence music composer
Cardsmith - Capture ideas and collaborate in real-time
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.
Music on Vine - Vine, now with music. Make 6-second music videos.