After many years of buying sheet music, or printing lyrics/chords from the net. I've now downloaded a great app called SongBook. It converts songs from a .txt file (see chordie) and displays the lyrics, complete with chords (piano too) & chord diagrams if needed onto a tablet, in my case an android one. It autoscrolls the song as you play which is infinitely better than sheet music as (1) the font is larger (2) there's no flapping/turning of pages. Another cool thing is the key changer - It transposes any song into a key of your choice!!
Maybe I'm preaching to the already converted, but I'm seriously impressed!!