To me, the main part of the Solo theme sounds a bit like the main fanfare from Ready Player One. It's just a few notes before they go off into different directions, but watching RP1 and hearing the music I distinctly noted when Silvestri applies the heroic version of the fanfare (at the end of 'Hold On to Somthing' around 4:25 for instance) how much it sounded like the main refrain from Williams' Solo theme (I had seen Solo and listened to its soundtrack first but I really enjoy both scores a lot). It's probably just a coincidence but I think Williams did visit with Silvestri on the RP1 scoring stage before working on Solo so who knows were such moments of inspiration come from? (Williams' use of it is a more complete statement, by the way, for what it's worth).