Ella sings Elvis...

Here's a quick video to further prove how powerful listening and repetition is to the learning process...

I dare you to find another method of teaching a 20mo old toddler how to have impeccable musical timing like this.   (I'm specifically referring to 4'20 in the video...)

Also, notice that after the song is over, she wants to hear it again! Listening & repetition folks! They work!