alt Hacker NewsLearning music from recordings (video or just audio) would be so much easy if modern video and audio playback software would bring back the AB repeat function that used to be common on CD players, DVD players, LaserDisc players, and MP3 players.
Why the heck did this largely go away?
Check out Amazing SlowDowner. And AnyTune Pro. Plus lots of yt player websites that allow for looping.