This is "Be Thou My Vision" Hymn Tune SLANE arranged for String Quartet, vocal solo or congregational singing in the key of D and Eb.  This is very simple and simple rhythm (piano or guitar) could be added as there is chorded lead sheet. - Great for a church service or wedding.  Simple and reflective. This arrangement comes in both D and Eb.

You can download the sample audio of this arrangement and a sample of the score.  There are other arrangements of this tune by hansencharts.com here on this web site.