Our 1 1/2 ur old loves it! We bought the full version and theres so many instruments & options to choose from!
When u press the bottom right treble clef, the solfege is sung in such an angelic voice even I like to replay it ;).
The only change I would make is maybe having the guitar option a little more shaped like a guitar and not just the strings for more visual appeal like the other instruments! Overall great app and Im so glad I came across it! When the little guy is antsy it really seems to calm him down & Im sure as he gets a little older and can understand it more, it will help him musically as WELL as entertain! :)
Facade1 about Music Sparkles, v3.5