Without further ado...
I love music. I've always said that I have three dream callings in the church - gospel doctrine teacher, seminary teacher, and ward music chair. A little over a year ago, I got called as ward music chair, so only two more dream callings to go. :-)
I used to collect hymnals. (I've lost most of them over the years, sadly.) There are so many really wonderful hymns that aren't in our LDS hymnal. For a while on Facebook, I had a Sunday feature where I would highlight some of them for my friends so they could see what's out there. I haven't done it in a few years. However, I still have a love of hymns.
Here are a few of my favorites that aren't in our hymnal.
1. Love Divine, All Loves Excelling
This is probably my very favorite hymn of all time. The music is beautiful, and the words are comforting and uplifting. It's a well-known hymn tune called Hyfrydol. You'll probably recognize it as the tune that "In Humility, Our Savior" is set to.
2. When I Survey the Wondrous Cross
I was first introduced to this hymn in the MTC when I joined the choir and we sang it for some occasion or other. (Fireside? Sacrament meeting? I don't remember.) It resonated with me instantly. The sacrament hymn selection in our hymnal is kind of small, and this would be a lovely addition.
3. Shall We Gather at the River?
I first heard this hymn when I was rehearsing for a choir tour the summer between high school and college. In addition to the music we were traveling to debut, we practiced this one so that we could use it at another occasion on the trip. The other occasion fell through, so we never got to perform the song, but it stuck with me anyway. I love the hope that the song conveys. "Soon we'll reach the shining river. Soon our pilgrimage will cease."
4. Holy, Holy, Holy
This one will probably never make it into a LDS hymnal because of the line "blessed Trinity" (even though the Book of Mormon is explicitly Trinitarian, though that's a subject for another day), but I love it because it brings out the wonder and majesty of God so beautifully. For what it's worth, the Mormon Tabernacle Choir performed a version that used the words "blessed Deity" instead.
5. I Heard the Voice of Jesus Say
You'll recognize this as the tune to "If You Could Hie to Kolob" (or if you're into Irish folk music and speed the song up to about double speed, "Star of the County Down"). I love the music, and this one has lyrics that are a little more traditionally Christian.
Honorable Mention: Come, Thou Fount of Every Blessing
No mention of hymns not in the current LDS hymnal would be complete without this one. It's lovely and grace-filled. I hope it gets put back in the next version of the hymnal.