My problem with method books is not lack of consistency or proliferation of options. The CBA allows for many alternatives and it's worth learning a few to apply to different situations. My problem is that they rarely explain the purpose of the exercise, or the logic behind the fingering
I'd agree with you that often the reason behind fingering is rarely explained in books. In their defence I guess often its hard to put it into succinct language.
My test of good fingering is that:
- it needs to avoid putting any tension in your hand especially across your palm/in between fingers
- you can play it consistently really fast and really slow
- it feels natural i.e. it doesn't need massive amounts of practice to achieve some strange contortion or over thinking
- it never goes wrong i.e. often I've found that fingering I've had to practice loads to achieve consistency is suspect and under pressure it fails, so its time to think again for something that is bomb proof and easy
In the few lessons I've had from really world class players we've never done any scales or used the various scale fingerings as an approach to real music (which initially surprised me) but rather looked at
principles of good fingering on a 5 row e.g:
- as far as possible always use same/consistent fingering for same pattern/sequence of notes in a piece of music irrespective of the pitch they sound
- when a note is repeated, always use a fresh finger on it for clean articulation and to get your hand ready for the next passage. This is the most valuable thing I have ever learnt for 5 row fingering and use it for all music from french musette tunes to folk to pop music to Scarlatti.
- its got to feel comfortable and natural in terms of the way your hand works
As I said before I think personally its better to think in
principles of good fingering rather than
systems (scales) of good fingering. In other words, asking the right question first: 'What are the principles of good fingering?' rather than 'What scale systems are there for a 5 row?'
For me (as someone that has played piano/organ on
inconsistent black and white rows etc for decades) scale systems really help you with real music on this sort of keyboard. Conversely for a 5 row
consistent keyboard its the principles of good fingering that you need to think in and not to relate it to instruments where scale systems are invaluable.
Otherwise you are trying to play football using the rules of cricket which would cause anyone anxiety!
Apart from the one fingering pattern to cover all scales mentioned earlier, I personally wouldn't worry about scales any further. Thinking in principles really makes the 5 row make sense as its surely behind the thinking of the brain that invented such an amazing keyboard for music making where the keyboard sits on a vertical plane.