Process (a #TBT)
It is always recommended for artists of all stripes to carry some kind of notepad or sketch pad with them at all times, for jotting down ideas on the go.
This is a page from my notepad/scheduler from April, 2010. You can see my classes for that day, that it was a sunny day, a reminder to bring life savers to my voice lesson the next day, and that I planned to watch Casablanca off Netflix that evening. (Old-school DVD style!) I also wrote down a few stanzas of poetry as the lines came to me, because I was sitting on the bus thinking about what a nice day it was. Later that day I edited the four stanzas into a poem, and a while later set them to music as a song.
So you never know when, in between grocery trips and bus rides on a sunny day, you might have an idea that can go somewhere with a little more work.