I think it's a very good app. I really like it and have done a lot of work with my students. I'm already a subscriber, but I still need to improve things like the language, because for other languages, it's not always easy to get the voices right and to translate the lyrics correctly, especially Portuguese from Portugal, which is always mixed with Portuguese from Brazil. Another thing that needs to be improved is that the lyrics are mixed with the text describing the style and this immediately spoils the song, as the text is not part of the lyrics. But I'll give it a 5* because I know it's still in the process of being perfected.