I have like…0 expertise in music, but I WILL find a way to make a motif for Achilles just for me. Just because I want to. For my little hypothetical Ilion the musical.
Achilles’ instrumental motif would have to be something that can be played slowly for elegance, but also rapidly and can be distorted to truly encapsulate his rage. Something similar to how Odysseus’ motif and instrument (guitar) can be sped up, slowed down, and distorted to show his caring, wits, and ruthlessness.
Achilles is a great warrior, but also a musician. We see him drag Hector’s body around Troy, but we also see him gracefully playing his lyre to Patroclus. My current thought is that maybe Achilles’ instrument could be a violin. It’s graceful, can be played in high action scenes, and we have that lovely distortion of the instrument that can work beautifully when used properly. Oh yeah and it has an electric counterpart which Jorge can use for more supernatural moments in the story…or something like that.