Ever listened to a little kid practicing the piano?
I remember diligently (OK, that is a rosy reflection. Begrudgingly…) doing my 30 minutes of practice a day. Well, most days. I would play the same song – usually as fast as my fingers would go – until the timer beeped and I bolted off the piano bench to play or read or whatever.
The thing about practicing the same thing over and over is that sometimes I would learn a song and learn one note incorrectly or with a weird rhythm. But I wasn’t able to hear the part that clunked. I bet my neighbors did, though!