KaraDoReMi is an innovative song learning mobile application using YouTube. Bring amazing song learning and karaoke experiences to users. Main features include: 1. Using YouTube video to learn songs and singing performance can be evaluated and scored in real time 2. Song learning by song structure 3. In-depth singing performance analysis 4. Global single song leaderboard 5. My Songbook 6. Continuous Practice Songbook 7. My Recordings 8. Vibrato Skill Challenge