I have never found a need for a diagram comparing ppiano anad continental keyboards. Assuming that would be students are at least familier with some of the more common scales working these out from a keyboard chart is dead easy and so doing helps to stick it in the mind and put it into In respect of the C system the key of C starts on te outside row and using only the outside 3 rows it is not rocket science to see where CDEFGABC is!.
If you want the quickie way of playing this scale will work for 12 major keys , just starting on the keynote ( on one or other of the 3 outside rows ) and doing exactly the same .A better method is to plot the scales using just the outside 3 rows which means 3 scales of patterns for 12 ;keys.
In answer to the question why learn on 3 rows when you may haave 4 or 5 playing the bulk of a tune on the outside 3 lends itself to easier fast fingering aand easier key changes. It also keeps the hand and fingers in a more comfortable position much of the time. The 4th row , favoured by the French) provides some useful choice in order to facilitate some difficult bits of fingering ( depending of course on the tune) and is enough for most purposed.. the 5th (inside row) does a bit more of the same but is less essential.
The advantage of learning the 3 fingering patterns does not become apparent until reasonable proficience is achieved ( I learned the lazy way using one fingering pattern and eventually decided to relearn using the 3. It would have saved a lot of effort if I had gone up the 3 scale route from the start.
george
If there was an emoticon of an exploding head ,I would have used that..............
