My wife and I perform as a piano/bass combo at church, and we love our iPad sheet music.
Like others, we use forScore.
She has a gigantic supersized iPad on the piano, so she can see two pages side by side, and years of super ninja skillz at flicking pages means she simply reaches up and taps the edge of the tablet to flip the page.
I use a smaller iPad that I rest on a music stand. I can’t turn pages and play the bass at the same time, so I have the PageFlip Firefly. I can toe-tab forwards and backwards through my music.
It is lightweight, has little lights on it to let me know it’s alive and make it easy to see in the dark. It runs on regular batteries forever, so no need to recharge it.
I used to use an AirTurn pedal, similar to this, but the build quality was pretty dodgy, it had an internal battery with the ubiquitous USB charger, and the USB port came out one day.
PageFlip has been going strong for a couple of years now, with zero complaints.
We probably have 1000 pages of sheet music on our iPads, and we keep all of our setlists in forScore, tracking what we play each week (10 songs, counting the regular ones). This is nice because I can go in and see “When was the last time we played ‘How Great is Our God’?” and it will show which setlists have that song in it.
This is all above board too–most churches belong to CCLI, a Christian copyright licensing organization,
and they have a premium paid service called SongSelect where you can download all kinds of contemporary Christian sheet music in PDF format in any key you desire.
ETA:
I forgot to mention one of the best parts of forScore: I use my Apple Pencil to write my bass lines all over the music. I can write all kinds of cheat notes on the pages, just like real music, in multiple colors. And if I want, I can share my marked up music with my wife via AirDrop, though she usually erases all of my bass annotations, since that’s not really useful for the pianist.