This is La Di Da by Khu.Sh. Can't sing? Doesn't matter! LaDiDa can automatically tune your voice to the correct notes and add studio-quality vocal effects. LaDiDa is a reverse karaoke app that uses artificial intelligence to help you sound like a professional singer. You SING or RAP into the phone, and LaDiDa will analyze your voice and compose music to match. Also works on melodic instruments such as GUITAR.