Yokee - Karaoke to YouTube videos
Flowkey - The easiest way to learn piano with your iPhone or iPad
UltraStar Deluxe - A free and open source karaoke game inspired by the Singstar™ game, runs on Windows, Linux and macOS.
Yousician - Learn to play music at home, at your own pace
Online Karaoke Pro - Online Karaoke Pro the newest and trendiest online based karaoke website where you can sing...
Melodics - Melodics is a desktop app that teaches you to play MIDI keyboards, pad controllers, and drums.