Seltzer is a setlist-focused lyrics display program, with controls and search features designed for a live performance context.
Seltzer is on indefinite hold, but may return as freeware, if we can figure out how to get the python packaging to work.
Sheet music is in standard Chordpro format. Chordpro was originally created to be a simple way to print out sheet music, from files that could be edited using a simple text editor. This makes it very easy to edit with even the most basic text editor. Now it is a standard format for song lyrics and chords. A plain text file with no markup is also valid chordpro, which makes it easy to prepare lyric sheets in a hurry.
On stage, I often have a computer in front of me for the synth or backing tracks. And I was setting printed lyric sheets on top of that. And then using duck tape to hold it in place in the wind.
"This is silly," I thought.
I could not locate stage any stage-focused lyrics display software that would also integrate with software apps (send MIDI). So I wrote Seltzer.