Song performance evolution

I've really enjoyed the lessons here...and learned a lot from them. David Hodge is terrific! Something I'd love to see though is some revisiting of songs presented with added sophistication. That is, leaving the original "easy" or "intermediate" lesson up, but adding a sequel lesson with added technique and difficulty. This would fit well into David's and others' suggestions about making songs your own. By showing how a song can evolve from simple to complex playing, readers could get iet ideas that generalize to other songs. Actually, that might be the basis for a new category of lessons, "Advanced Lessons" in which virtuoso technique is applied to simple songs. Just a thought.