If you find it easier to play with music then do that. If by memory then do that.
...The constant monitoring of what we are doing is what exhausts our mental resources. For that reason, I strongly recommend to learn the pieces by heart when preparing recitals. It's the only way we can allow us to play with some leeway. If are dealing with extra stress, then we have some wealth of focusing to allocate to handle it.
I strongly believe that there are two different stages in piano performance. One in which we are controlling every single thing we do when we play and another one in which we are just "letting go". The constant monitoring of what we are doing is what exhausts our mental resources. For that reason, I strongly recommend to learn the pieces by heart when preparing recitals.
j_tourI really like your answer and I adhere to it. It is interesting to see that at least I have one colleague who is not openly again playing by heart
I strongly believe that playing by memory requires a bigger effort than doing so using the score. The confidence frame offered by the score itself it is lost when we leave it behind.
Permit me to add to the confusion. Playing from memory has a certain element of mastery associated with it -- from the standpoint of the audience. However, playing with a score present does not necessarily mean that one is reading every note of that score. If one has practiced the piece sufficiently to dare performing it in public, it is very likely that one is using it more as an aide-memoire than as a score.I will, with your kind permission, use myself as an example. I am an organist by training and profession, now retired. I always had the score present on the instrument when I was playing. Did I read every note? No. In fact some pieces which I had played to death I looked at before starting, mostly to make sure that the registrations were all set correctly, and then paid it almost no attention. Other pieces -- longer, or more complex (think a Widor organ symphony, for instance, or a Bach triple fugue) I did look at it from time to time.I do the same thing with piano music. And I never conducted a choir without a score, although I could have (and more than once did, when the score fell off the stand...).The advantage to playing mostly from memory is that some passages require some attention to where the hands or feet are going, and if one looks at what one is doing one can be a little more reliable.I would never fault a musician for using a score -- or for not using one! -- provided their musicianship were up to par.