This app was mentioned in 4 comments, with an average of 2.50 upvotes
Something like this one I'm assuming, although there are several to choose from.
https://play.google.com/store/apps/details?id=com.hecorat.acapella&hl=en
Same app function, from a different software company
Possibly Acapela Maker? https://play.google.com/store/apps/details?id=com.hecorat.acapella