A 1-2 minute loop. I'll try to mimic whatever sort of sound you're wanting.

I load up Bandlab and crank out some tunes! Sometimes I'll start by playing and recording my guitar in Audacity, and on occasion, I might play any other instrument I own over it - melodica, ukulele, etc. But, usually, I'm using synthetic instruments on Bandlab. I just try to make music that sounds good. Add some effects here and there... and boom! Export it and now I have a song.