For me, the process varies really, but overall, I'd say it flows out of me in inspired moments. I can't ever just say "Hey, I'm going to write a song today" and expect it to turn out like anything worth listening to. During my moments, however, I will sit down for a period of time ranging from minutes to hours until it sounds right. With the exception of the odd line of lyrics, usually the music comes first, and the words after, such that they fit the mood of the song they're accompanying.
And yeah, like Kramerguy, I've had a song in my head for a full day at work, and didn't end up transcribing it until I got off for the day. It actually turned out pretty nicely, too.
Right now, lyrics are a pretty easy thing for my current project, since the project is built around a centralized group of characters. I just have to focus on advancing the story in the best way possible, and the words come together just like that.
And yeah, like Kramerguy, I've had a song in my head for a full day at work, and didn't end up transcribing it until I got off for the day. It actually turned out pretty nicely, too.
Right now, lyrics are a pretty easy thing for my current project, since the project is built around a centralized group of characters. I just have to focus on advancing the story in the best way possible, and the words come together just like that.