I always like to mention Epica for these sorts of things. They've got songs with full death metal style growling like Serenade of Self Destruction[1] in the same concert as a performance of Pergolesi's 1736 setting of the hymn Stabat Mater Dolorosa[2].

[1] https://www.youtube.com/watch?v=-hW7EfiBwm0

[2] https://www.youtube.com/watch?v=nhtOORYTGx8