OnSong is okay (I own that one too, as well as Good Reader and FilePro)...but doesn't have the same oomph that UB has, but it DOES have one thing in it's favor...it loads and reads natively the old ChoPro format of text file....

These are the ones that have the line of lyric with the chord embedded above the line...it even scrolls the page of text in time with a metronome too if you want...BUT if cannot load or play MIDI data....which is why I don't use it...there are other threads about why this is so...and as your OP is not directly related I will leave it there

Dennis