Well, I ordered the book and tried the free version... The information is gold, there's no denying that; except the fact that the app has a tendency to crash when switching back to the app, after watching a video. It crashes about 70 percent of the time, and it seemed to happen more often, the further into the book I advanced. If they can fix the intermittent crashes, this app is very useful. I might purchase the full version of this app, though it really needs to work without having to be restarted every time. Mobile phone: Samsung Galaxy Note 4 with Android 6.0.1.
Train to Sing in Tune – Vocal Exercise, Warm-Up, Ear Training and Singing Lesson
Sing free songs with the pocket version THE VOICE with this karaoke singing app!