It's hard to talk about lyrics independently of music, but I will try. Obviously, all the principles of writing apply to lyrics: grace, affinity for words, a feeling for the weight of words, resonances, tone, all of that. But there are two basic differences between lyric writing and all other forms, and they dictate what you have to do as a lyric writer. They are not even rules, they are just principles. First, lyrics exist in time—as opposed to poetry, for example. You can read a poem at your own speed. I find most poetry very difficult, and there are a few poets I like very much. Wallace Stevens is one, but it takes me a good 20 minutes to get through a medium-length Wallace Stevens poem, and even then I don't understand a lot of it, yet I enjoy it and can read it at my own...