I have zero musical knowledge or talent --nada. In fact, people tell me to stop humming because I do it out of tune. Lucky for me my ten year-old son and twelve year-old daughter are quite the musical experts needed for this Good FREE App of the Day, Melody Composer Squared. The developer, Pavlo Karnaukhov makes melodies more understandable to visual learners like me. Click through to see how come I like this app and why your kids might enjoy it too.