I’ve transcribed this in Em for the most part but there are a couple of “A-tonal” sections that are classic Slayer where there are some harmonic movements that just sound “evil” and nasty but don’t really fit into any key or mode and for those I’ve removed the key signature and as such it looks like C Major or A minor but it’s just a convention to reflect “A-tonality” or the non-diatonic nature of the riff.
