Free version - https://play.google.com/store/apps/details?id=com.jumbly.singalongad
Singing on your own or with friends; indoor or outdoor; night or day.
All lyrics and keyboard action is displayed on screen.
Song library currently contains over 360 titles. A varied selection including: - Hymns, Nursery Rhymes, Music Hall, Musicals, and many more.
Current full song list here - http://www.jumblyapps.com/SongList.html
No adverts. No in-app purchases.