VERY IMPORTANT: In Songify, there is a page of songs shared by other users that includes some definitely-not-safe-for-children material. That page can be locked, however, very easily by simply pressing a button and entering a four-digit passcode. Be sure to lock that page before letting any child try the app by themselves.
(I also wanted to post this review for anyone who had downloaded the app and didn't know about the sharing page.)
Songs can be saved, emailed, posted on Facebook or sent via Twitter.
There are in-app purchases for other beats and types of songs, but, as I usually suggest, you can also just keep the free stuff. I rated only three and a half stars because of the shared songs page. If there were a real kids version without that section, the rating would be four and a half or five stars.
(Thanks to Smart Apps reader Maureen for suggesting we review this app.)