You can both try if you want.
I have this idea of using 3 different tempo riffs and 3 different tempo beats, changing what goes with what / when. Sounds should be dark and echoing.
As opposed to guitars, keyboards are closely tied in with a chosen sound. So I'm only thinking about a few orchestral hits.
I asked about guitars, because I had in mind using the slow riff and the fast riff together at some point.
Nothing too complicated technical-wise, it would just be exciting to try mood swings in a song. One guitar, drums, bass, and orchestral hits would do.
Of course when you read a description of a song, you will hear your version of it in your head, so notes are up to you.
Whatever, here's something for you to try. It's not radical in terms of sections, but can you create three different tempo beats and three different tempo riffs that each sound fitting together? This song is radical only in that aspect!
Intro:
Slow drums + slow bass
Fast riff + fast drums
Verse 1:
Medium riff + medium drums
-Two orchestral hits-
Medium riff + medium drums
Verse 2:
Medium riff (an octave lower) + medium drums
-Two orchestral hits-
Medium riff (an octave lower) + medium drums
Interlude:
Fast riff + fast drums
Pre-chorus:
Slow riff + medium drums
Chorus:
Slow riff + fast drums + keyboard choir of your taste
-Two orchestral hits-
Verse 3:
Medium riff + medium drums
-Two orchestral hits-
Medium riff + fast drums
Breather section:
Slow riff + slow drums (same as intro) + keyboard choir
Chorus:
Slow riff + fast drums + keyboard choir
Outro:
Fast riff + fast drums (same as interlude)
I'd imagine this lasts about 3:00 - 3:20 or something. No solos. I'm not describing the mood of every section, leaving room for your creativity, just hoping you come up with something that sounds dark and sinister, no Iron Maiden stuff.
If you can pull it off then we can try to make some cult shit with radical song construction.