I've always had the impression that Lemmy doesn't spend more than 15 minutes per song writing lyrics or music for Motorhead. He just bangs it out in the studio and it's done. And I'd say that formula works pretty well more often than not.
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I used to be with it, but then they changed what "it" was. Now what I'm with isn't it, and what's it seems weird and scary to me, and it'll happen to you, too.