I started this playlist while I write a smut one shot (will be my first Ao3 fic) and River started playing, and I realized it reminded me of Counting Bodies Like Sheep.
Sadly there's no instrumental of CBLS, but Rover's vocals can be played during most parts there is no vocals during CBLS.

River (vocals) by Bishop Briggs:

https://youtu.be/Z9dW5e5hFEM

(Speed to 1.1x or 1.15x)

Counting Bodies Like Sheep To The Rhythm Of War Drums (music) by A Perfect Circle:

https://youtu.be/93ByMEx50Zc