I need a system that I can use to store sheet music that I am currently learning and/or performing. To clear up, I need some sort of folder or display book that will let me store multiple pages of sheet music at once whilst still being able to read and make notes on. This system can be solely for sheet music or another type of folder or be another type of folder that will store A4 sheets. I don't care if I have to buy a folder as well as tabs, I just need to be able to read the sheets clearly and edit them when need being. I need to use the folder at home while learning or playing a song and on stage.
I have always used a good old-fashioned 3 ring binder and that does the trick. Easy to store, transport and keep music organized. I organize by composer last name, then by song name to keep it easy. In a 3 ring binder, it's also easy to make a quick notation on the music, which isn't as easy if you have them in a plastic protector or on some sort of tablet. Good luck!
Apart from obvious solutions, it may be possible to use scanner together with tablet. Scan the sheet music and keep the content on the tablet. A single tablet uses up very little space, is easy to put on then note holder and can contain lots of scanned material.
The negative side is that it is more difficult to read from the tablet and only one page is visible at time. Hence it is more suited to store something you already know well and just need a slight reminder on how the notes go.
Also, buying scanner and tablet just for this purpose looks expensive and may have some learning curve (how to scan, how to transfer to the tablet, etc).