Michael Mahler’s take on Ps 27 is No126 in AOV NG. It’s a bit wishy washy actually. There is a longer than usual sample to listen to here.
The problem is we are doing John Bell’s Singing the Unsung DVD course at the moment and his setting of Ps 27 is so much better I wouldn’t bother with this one. (I did find a version of John Bell’s setting on Youtube.)
Still, you can learn Mahler’s song from my backing if you like and I may well be wrong about it.