The Church of Jesus Christ of Latter-day Saints has its own unique musical traditions. Some might call our worship music boring, but the truth is a little more nuanced. The purpose of music in the LDS church is to invite the spirit, not take its place. It is as much for contemplation as entertainment.
There are clear policies about music outlined in the church handbook. These include the exclusion of brass instruments from being played in sacrament meeting. Obviously drums and electric guitars and other instruments generally associated with rock and roll are also inappropriate for this setting. However, many decisions about music and instrumentation are left up to local and regional leaders.
I have personally never attended a sacrament meeting that included a guitar performance. I'm not sure I ever will, although I have heard of it happening in some wards. My guitar teacher played beautiful nylon string guitar hymn arrangements, and his bishop occasionally invited him to play in sacrament meeting. I have brought my guitar to church a few times to perform reverent music for a primary class, but I have not been asked nor have I sought the opportunity to perform in sacrament meeting. I understand that there are certain associations with guitar music that make it seem a bit questionable for some leaders. Fortunately, I also play piano, so I have been able to play that instrument in sacrament meeting. Interestingly, both guitar and piano can be played very reverently or very irreverently, but I defer completely to the judgment of ward leaders who follow the direction they've been given by their leaders and the promptings of the spirit in such matters.
For me, playing guitar hymns is usually done in private or in a guitar lesson setting. It is not necessary for me to play for a large audience to enjoy and feel the spirit of the songs. Like David, who played the harp while watching his father's sheep alone, I can be edified and taught and have my testimony strengthened by cherished hymn melodies. Each performance is like a prayer ascending to heaven, and an opportunity to express my love and gratitude for Jesus Christ.