Okay I gotta frigging infodump about this!!!
Optimus’ theme in the Transformers movies. It is literally, and I mean literally, the sound of his Spark-pulse.
Grab your headphones or pull a speaker up to your ear and listen.
Do you hear that faint tink-tink-tink noise of violinists plucking instead of moving the bow? That’s the pulse of the piece. THAT IS OPTIMUS’ SOUL. That sound is present throughout the entire song. It’s the first thing you hear and the last thing you hear. It’s there, even when other instruments almost drown it out. It is still there.
Then you get this flute to establish the melody. I think it’s a flute, but it could be an oboe. They sound very similar to me. Anyway, why is it so sad? Because his Spark is sad. He watched his world die, and he’s part of the reason it had to die. He’s watching his war spread to another world that is totally unprepared. He can’t let that world die, too. But he feels alone, because who do you look up to when you are the one at the top? To be a Prime is to feel alone.
And suddenly that flute changes. Now there’s strings and brass playing the melody and voices come in as a bit of “coloration” that makes me think of light. That is the courage coming out. That is the Prime in Optimus Prime. That is where he is looking ahead and deciding he will do whatever it takes to protect other worlds from the same fate as Cybertron. That is hope. That is Optimus standing up and saying “Freedom is the right of all sentient beings.”
Here comes the percussion. The same melodic line played in the previous section repeats, but now it has percussion behind it. What is that? It’s Optimus charging into battle. It’s his determination to protect, to sacrifice and to fight for what is right. The voices rise and that is glow of his Spark brightening into his optics as he stands up for what he believes in.
Even Optimus’ beliefs can be shaken. Sometimes he loses sight of his goals. But, in the ruin of his doubts, he always rises again and again to fight for freedom.
And THAT is what is in his Spark and THAT is what his theme sounds like.