For music sharing we use Dropbox. Our group leader uploads individual PDFs into a file accessible to all of us. The beauty of this is that most of us show up with tablets, connect to Dropbox and simply pull up the song we're singing. Dropbox has the capability to display PDFs instantly, without downloading. So, you can go to Dropbox before our meet-up, download and print the selections OR use a tablet and skip all of that. No paper. This also has the advantage of everyone always having access to the updated song list, which eliminates oodles of confusion. Dropbox automatically stores things in alphabetical order, so it's quick and easy to find a song from the list.
This also means that I've got our whole collection available on my tablet, phone, home computer or any other connected device, always up to date.
For those who want more, you can pull up the song from Dropbox straight into one of the many PDF reader apps available. I have one that allows me to make notes, highlight things or whatever on the sheet then save it.
I believe Dropbox is free up to a certain point. I have a paid version because I back-up all sorts of stuff to it, including all my pics. I'll never lose all this stuff with a hard-drive crash, and I can access any/all of it from any device anywhere.