Here's a quick link to watch the Mormon Tabernacle Choir singing the Battle Hymn. Notice three things:
1) The vowel shapes of the men-- the mouth barely even changes between "glo-" and "-ry". They flip the "r" and keep the lips round while the tongue shapes the "y", just like we've worked on.
2)The vowel shapes of the women--how much they open their mouths even from the beginning "gloria".
3)Listen to the tempo changes; I will conduct it very similarly to this.
http://www.youtube.com/watch?v=pmTWVJ_pXBk