This app was mentioned in 3 comments, with an average of 1.67 upvotes
I have found OpenSongApp to be relatively useful.
It was designed for worship leaders, but you can put whatever music you want in there.
It has a built in feature for pulling music from Chordie, Ultimate Guitar, and Youtube. I haven't used the Youtube one yet. The Chordie and Ultimate guitar features are nice for getting the words and the approximate locations of the chords, but you need to do a bit of formatting after importing.
Once you get your library set up, I have found if fairly useful for setting up a 'set' of several songs and quickly playing through them.
I've written a free app that does this using your OpenSong songs. Worship leaders can use it as a replacement for their song sheets and it can project words and stuff. I have it projecting remotely via ChromeCast. It's called OpensSong Tablet and you can find it on the Play store: https://play.google.com/store/apps/details?id=com.garethevans.church.opensongtablet&hl=en_GB
A quick guide can be found at: https://sites.google.com/site/opensongtabletmusicviewer/home
Blessings, Gareth