QUOTE(skylark @ Aug 7 2008, 08:22 AM)

Can I ask a question about arching please...
I've seen some concert pianists with a very pronounced arch (claw-like) and others with a flatter hand position. I much prefer to watch the ones with the flatter hands - they just seem to glide over the keys whereas the pianists with the claw-like position appear to make it look much harder work and in my opinion it's much less pleasant to watch.
Can anyone tell me why the arched position is so important - I'm gathering that it's to do with keeping pain-free tendons, wrists etc - but does anyone know why some concert pianists have flatter hands and presumably don't suffer from tendonitis etc?
The arched position with curved fingers, when used correctly gives maximum control, and most efficient application of force. I read somewhere that for a given amount of effort flat fingers generate only 70% of the force of curved fingers. It is also - of course only if done properly - the position in which the fingers and hands have least tension in them. Curved fingers and raised knuckles was the standard basic technique from the late baroque and through the classical period, but it has never been a fixed thing to be maintained rigidly.
With the Romantic period came all kinds of new techniques - wide spread arpeggios, bigger chords, more use of playing widely spread independent parts in one hand, and so on. Some of these (e.g. Chopin Etude Op 10 No 1) are only possible with a flatter hand position and with more extended fingers.
Many concert pianists use the classic technique whenever possible, and only deviate from it when they have to. Some use the flatter position sometimes even when it is not essential so as to have more variety in touch and tone. A very few use primarily the flatter position and get away with it, because they are extremely relaxed in general, have huge musical ability and extraordinary co-ordination. (And of course some so-called pianists use any old junk and neither think about what they are doing, nor listen to the sound they are making)

<-- Playing with bunched fists!!!
This is NOT recommended - but it does create a passable impression of the music of Pierre Boulez.