The classically-tinged interlude is a proud death metal tradition, giving lie to the popular assumption that this is a brute’s music. It is that, without question, and unabashedly so, but as can be sensed from these pieces on an instinctual level, it is so much more too.
Please feel free to add others in the comments.
Brutality – Sympathy
Osculum Infame
Pestilence
To start: Morbid Angel has a couple, I’ll pick Desolate Ways
Obsequiae do masterful interludes: https://youtu.be/c1LPsrHBHbU
Not a separate track, but the intro of Gorguts’ Condemned to Obscurity comes to mind.
Absu – Bron of the Waves https://www.youtube.com/watch?v=wn9a4G4BuO0
Atheist – An Incarnation’s Dream https://www.youtube.com/watch?v=AMdtFuFEIZE
Blood Incantation – Meticulous Soul Devourment https://www.youtube.com/watch?v=HG_xFV9XkWM
Catacomb – Nemesis https://www.youtube.com/watch?v=1yYSnrjFswE
Cenotaph – The Silence of Our Black Oceans https://www.youtube.com/watch?v=U_H50gctXVc
Cynic – Textures https://www.youtube.com/watch?v=VxuvUHQ8HV8
Dark Tranquility – Lethe https://www.youtube.com/watch?v=453K_J_4gTI&list=PL83jyJGJjAyYkGd8VSpyX_PnRK5SAucBU&index=8
Death – Lack of Comprehension https://www.youtube.com/results?search_query=death+lack+of+comprehension
Edge of Sanity – Enigma – C) The Loss of Hallowed Life
Katatonia – Elohim Meth https://www.youtube.com/watch?v=-qC4iVFPJr8
Phlebotomized – Dubbed Forswarer https://www.youtube.com/watch?v=QZpsUphkecw
Purtenance – John 3:16