Hi, I am LDS and would like to say that we do not alter that many songs and it's noted when that is done. The prefference is for those that don't differ from our doctrine. Can you blame us for that? I know that if I'm singing something, I want to be singing in accord with our teachings.
For tunes, the emphasis is on ease. I have a facsimile of the original collection, which is very nice.
The songs in the current collection are drawn from many sources, including several Protestant or Baptist ones.
A very few are from the English Hymnal.
They tend to have attributions.
Try this link: