Sometimes my current job can be a bit mindless. Painting, mudding, sanding, gluing, framing. they all take my attention, but not much thought. I will typically write songs or vocal melodies while I build. I'll replay some guitar riffs in my head until I like the structure. Or, I'll play some prerecorded stuff of a friend... on my phone until they're memorized... rebuild their sounds into a structure that I like. Time can fly when I'm thinking about music. And hey, I just got paid to arrange a song.