Ditty is an audio application developed by Zya. This application lets you send unique audio messages to your friends on Messenger.
Once you've installed Ditty, you'll be able to create a message using music that comes with Ditty. From there, you'll be able to add various messages that appear on the screen while the music is playing.
Much of the music catalog that comes with Ditty is free with songs like Twinkle Twinkle Little Star. However, some of the music you have to pay out of pocket for if you want to use it in your messages.
Overall, Ditty is a fun way to send unique messages to your friends on Messenger. The only drawback of Ditty is that you're limited to only 70 characters for every message.