Easy Stage

This app is divided in two parts:
A very easy part presenting your music sheets in the order of your set list. A metronome helps you to count in. Get to the next song by simply swiping with your finger to the left. All this works offline.
The second part manages your music sheets stored local or on Dropbox. Your Dropbox files are downloaded to your local storage. Alternatively, you can drag files from your Mac or PC to the EasyStage directory on your iPad or iPhone using Finder or iTunes. You can create different set lists for each gig by dragging files to the concerning set list.

更新履歴
The professional-version as in app purchase gets new additional features:
You can exchange any set lists between devices - including those of fellow musicians - via airdrop, mail or files.
There is a search function in the window where you organize your setlists.
If you don't use a foot pedal, for example because you have an older device that doesn't support the latest Bluetooth version, then you can have your scores scroll automatically on a timed basis.