Definitely one of the hymns rarely sung. I am not familiar with the words, but the tune rings a slight familiar chord (ha ha ha....) when I look it over. It is not one that I can hum right away if asked on the spot with the music. But even not knowing it well myself, it is a nice tune. The lyrics are about the wondrous blessings that now come to every land--the world--because the Gospel has been restored. Those scattered will be brought back through missionary work. The captive--both alive and especially those who have gone on before--now have the chance to be free. As the title says, it is all glorious! And I think the tune helps to reflect that.
Can't help but have a little smile that the third verse has "there their" in it. :-)
From the history book
The author of the hymn is anonymous, but must have accepted at least the Book of Mormon, since that is "Ephraim's records" referred to in verse 1, according to Bruce R. McConkie. The text was first printed in 1840, but the tune did not come until 1889.