Either let them choose their own titles or assign them. Tell history of a musical instrument, show the parts and how to put it together, show how to play it. Give a matching quiz. In a recent workshop, Sister Elizabeth W. Pierce answered questions on copyright laws. One may make one copy of sheet music to mark up for analysis or, for example, give director's cues in a performance to preserve a clean copy of the music, so long as the copy is not shared with others.
Copyrights do expire.
After that date, the duration is the life of the author, renewable for 50 years. For works copyrighted by companies, the duration is 75 years. Thus illegally copying music for use in a ward choir, could easily bring a lawsuit for millions of dollars. Thus, it is absolutely necessary that Church members scrupulously observe copyright laws. If there is no such notice, the hymn is in the public domain and may be freely copied.