Show lyrics like Karaoke or Worship slides
Christians really like to sing with their music as worship and for fun. They are accustomed to doing it at church. On Android, I can play Overflow and use SoundHound to find the song and search for lyrics. Would be great to have that integrated into the app. A few people could have a worship time together using the app. I don't know of anyone that could compete with that, even if it's a community managed lyrics wiki used to supplement any other sources. Don't know how you would overcome licensing cost issues, but I hope you will look for creative solutions..
but I agree
spotify has the ability
These 2 ideas are great for both hearing impaired (often easier to hear music than to understand lyrics) and for those of us who are homebound, having video of especially live events helps to feel as if part of the event as well as being with others during worship.