Spencer/Brendon, with previous unrequited Brendon/Ryan, and Spencer & Brendon bonding over shared ideas about musical direction which Ryan & Jon are steamrollering. Brendon having song ideas that Spencer thinks are cool, and the two of them getting excited about half-finished songs, and then Ryan crushing them & insisting that his more overt 60s stylings & Beatles-pastiche direction is The One True Way, and Brendon wilting under Ryan's disdain, and Spencer gradually shifting his allegiance away from long-time-BFF towards Brendon because Brendon is OMG such an adorable wee scone, and has GOOD ideas, damn it, and the way he gets all pink and intimidated and polite and sad.

SpecificAndCanonical!Prompt is specific and canonical.