Others have suggested music stands. I personally find this pretentious, silly, and cumbersome, though others may embrace it.
What do you call those long music stand thingies that they have in the choir stalls? That's what I want. http://www.lukehughes.co.uk/index.php/design/sectors/ecclesiastical/choir/
I wanted to cool my face off by nuzzling the music desk, but this was discouraged. :)
Choose music that they can more easily commit to memory phrase by phrase. Then practice singing without the music at all (in other words, let them see how much they need the music).
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