I tried the digital music approach. There are lots of useful apps to markup your music, to add highlighting, to change notes, etc....

But I had to drop it and go back to ink and paper. The tactile nature is SO superior to learn music from, for me anyways. I enjoy the learning process more. I markup my music more. And, I get away and sing and play from memory more.

I find that interaction with digital work has a big effect on my attitude. Anything digital is consumed and discarded. It's infinitely reproducible, and thus instinctively less valuable. I find myself giving less worth to anything digital, simply by instinct. And of course, in preparing sacred music, we should have the opposite instinct: something close to dedication and reverence, instead of throwaway.

That's just my story, though. I know some who are diehard digital-only folks. It just doesn't fly with me, long term.

I use a tablet for 95% of all my music (some may remember me as "that guy" at the last colloquium).

I have a dropbox folder filled with tons of resources. SEP, the graduale romanum, graduale simplex, liber usualis, liber brevior, the offertoriale romanum, the chant abreges, the gregorian ordinaries, a decent amount of simpler organ music, parish book of chant (1st and 2nd editions), Richard Rice's communion books (english and latin), the cantus selecti, the simple choral gradual, parish book of psalms, the american gradual, the gregorian missal, collection of all the missal antiphons, the palmer burgess plainchant gradual, the revised grail psalms, Secunda anthologia vocalis (three voice motets) fr kelly's missal chants, nova organi harmonia, the entire collection of organ scores for the ordinary for when I sub at my parish, random resources downloaded from the forum, the roman missal, the entire repertoire for each of the several choirs I sing in, as well as any specific music for Masses for which I plan to sing/direct/play for (which as you might guess rotates around depending on what I'm doing), and a ton more.

It's between 1-2GB in all.

This collection lives in my dropbox on my computer, and also thanks to a third part app called DropSync, it is contained entirely offline on my tablet (nexus 7, 2013) and my phone (nexus 5) and phone as well. I have used both of them at Masses, though obviously the nexus 7 is what I typically use. I use dropsync because the native android dropbox app only allows you to download individual files, not keep your entire collection offline on your device and synced.

I'd recommend the nexus 9. I think it's a great option, and is quite fast. It should allow you to store all these things offline and keep them synchronized like I doubt you could on an apple tablet. Adobe's PDF reader on android also allows me to take and edit notes (both typed and scribbled) allowing me to fully take notes like any other singer, but also to sync these notes to my computer and phone, so that they follow me no matter what device I use. I also use an android task manager to kill all background apps when I am getting ready to sing to ensure there is absolutely no lag or delay in the processing.

I am very satisfied with this system. If anyone wanted to set themselves up with a similar system, I'd be more than willing to answer questions here or via pm. I've used this for about 2 years, so I am very comfortable with it and know all the tips and tricks.

There have been a few times when I've been asked to sub immediately before Mass begins. When that happens, during the Spanish part of the homily I pop up CC Watershed and look at the SEP for Communion; since I got the hang of them I am able to do them very well "cold" - maybe not 100% accurate, but close enough for the situation. So yes, I think there is definitely a place for electronic stuff. Btw, nothing fancy here- I have a two year old Samsung Galaxy S3. Don't think I would ever give up paper though.

Not a bad idea. Maybe even provide a public link to.my Dropbox folder....

Last Sunday, our Schola invited to other city to sing Gregorian chant with local choir.
Number of local number is so many, so we run out printed music.
I brought my iPad , and downloaded Graduale Romanum, so I Print Screen and email to other member who bring any gadget.

If you're a Lilyponder, you could always just get a text editor to edit the file and compile at the computer later (if you don't need immediate feedback).

One caveat- I downloaded OCP Accompaniment to two Android based tabs (Acer and Asus), didn't/couldn't route it through KINDLE, and the screen buttons in the task bar (indices, etc.) don't react, so I have to manually scroll tune to tune. One of my pianists has the same on his iPad which does respond to all button commands.