I almost always start with complete lyrics from a collaborator. From there I MIGHT use any of #9-14. But I've written songs (ie, music for lyrics) while walking, showering, driving...well, almost anywhere that part of my mind can engage. White noise helps. Sometimes I know what the musical inspiration is ("hey, that sounds like Neil Young!"), but most frequently it's just something that comes out. I know a lot of songwriting techniques that help, but how/if they're employed is hit-and-miss.

DC Ron
BiaB Audiophile
Presonus Studio One
StudioCat DAW dual screen
Presonus Faderport 16
Too many guitars (is that a thing?)