Elgar, Dream of Gerontius.
I have several recordings but my favourite is the 1976 Boult, Baker, Gedda, Watts version which I am listening to on a CD.
Can't find a picture of the CD art on the one I bought over 30 years ago they have changed it. Never mind.
I first heard some of the music as mood music in a TV drama and decided I needed to listen to a bit more. I bought this recording and still love it.