For my band, we all use a Split View layout with the song list on the left and document viewer on the right. For the vast of majority of songs, most of us don't ever need lyrics or documents so the document viewer just displays the title of the song placeholder. Most of us have gotten used to always seeing the title of the current song in this spot.
On a recent gig, one of the band members forgot his iPad and I suggested he just use his phone. This worked out great but one thing he noted that since his phone layout was just using the song list view, if he scrolled the song list, he wouldn't be able to see the current song title unless he scrolled back.
This was mostly a non issue and just took some getting used to but it got me thinking of a new feature:
Pin the current song to the top of the song list. It would behave much like how the Set list names are pinned to the top.
This also might be useful for another one of my requests: a live song queue. When a user wants to load another song to be the next song, it gets pinned to the top below the current song. They keep queuing songs and pinning them to the top, basically making a new playlist. If it gets too long, there probably should be a way to expand and collapse the top pinned queue list.