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I play in an amateur wind orchestra and I noticed that generally people do not play from memory at all and look into the sheets for the entire piece. I'm no exception for the most part but here and there I tried to lift my eyes up and remember the piece in my head - usually failing after just a couple notes and getting my eyes back to the sheets quickly. Now when there are critical points of the piece like changes in tempo for example people will keep an eye on the conductor but usually we'll quickly get back to looking at the sheets.

Now I've heard that in professional orchestras many players can play quite a big chunk of the pieces from memory. But are there any advantages to that? I can see that you might be able to keep a better eye on the conductor but even when looking at the sheet you can still get a glimpse of him at all times (though that can depend on your seat). And I also do see why you should learn a solo piece from memory. But as for our amateur orchestra, we are never in a position where we do not have access to a sheet in front of us. Not even when playing solo pieces.

What are the advantages of playing from memory? Isn't it much safer to just stick to the sheet? Do professionals actually practise playing from memory for an orchestra piece or is it just a side effect from playing the pieces a lot? In an actual performance do they play from memory even if it's not a solo piece or do they play the "safe game" for the entire piece?

Should I start to actively practise playing from memory when playing in an amateur orchestra?

Orchestra musicians should always be playing off of the sheet music. The concert is probably 1.5-2 hours of music, and it needs to be played precisely. In addition, professional orchestras rehearse about twice before the concert, so trying to memorize the music would be a waste of time.

Veteran orchestral players may end up with large chunks of common works memorized out of sheer repetition (if you're 60 and have been playing in orchestras since high school, you've probably played Beethoven's fifth symphony dozens of times), but it's still unlikely that they could play the whole thing exactly correctly without the music.

At least for me, but probably for many other musicians too, playing from memory works completely different compared to playing from sheets. What I memorize aren't individual, absolute notes. Rather, I know the chord progressions (more the chord functions rather than concrete chords), the anchor points of whatever melodic material I'm playing (in terms of scale degrees or chord-note), and for details like passing notes in between I merely memorise “the sound”. From this I then reconstruct the absolute pitches while playing.

This works well for rhythm-group work in a Rock / Jazz etc. ensemble. It also works very well for any kind of solistic playing, because knowing the piece means you can essentially sing your part and it will get stuck in the head automatically. Rendering such a melody onto the instrument is something a soloist should be able to do even without having ever practiced the piece.

It does however not work very well at all for most of the voices in an orchestral work. Such parts don't generally make musically sense on their own, only together with the rest of the orchestral. So to apply the above method, you'd pretty much need to know the entire score. This is really not feasible in most situations.

Reading off the sheet is normal, but at rehearsals it's pretty much necessary. Watching the conductor is important, and is far easier when most if not all your attention doesn't need to be on the dots.

Also, if you know the music, it frees up your ears to actually listen to what others are doing. That's difficult if you're still reading the pieces.

I've been in situations where all my music has been knocked over (in a live band situation with no stage available), or the wind has blown it over/away. If I hadn't leaned it, therefore knowing what to play, I'd have had to stop!

A concerto soloist will usually play from memory, but the orchestra is expected to be able to take notes, mark passages on the sheet music in pencil, converse with others about parts and markings. After studying orchestral excerpt books your memory will be reinforced by having the sheet music.

Typically only the soloist is expected to play from memory. it is really not all that feasible to memorise hundreds of pages of music that some symphonies consist off. That being said playing in a symphony is a bit more complicated than just a two hour long sight-reading exercise.

A well-drilled symphony will have a good understanding of the score, its main themes and have good knowledge of the motifs and the general structure of the piece, but a complete memory of the score is simply unnecessary.