I hear songs on the radio that interest me, write them down, and then noodle later. I don't take it seriously since I'm not a serious musician. I just listen to the song on the computer over and over and fiddle about. I'm trying to teach myself "White Rabbit" right now.......as soon as I learn it, I'll forget most of it. Plus I suck at chords so I don't take it seriously. I use it as an escape to my relatively pointless existence.