I would've written Billie Jean. Million dollar song right there with the best bassline EVER written!!
Speaking of Billie Jean, have you seen this video? I think it's hilarious. And the bird moonwalks too! https://www.youtube.com/watch?NR=1&v=4pN2xsO68ww&feature=fvwp Anyway. Right now I'd have to go with Joni Mitchell's 'A Case of You'. The lyrics are honestly some of the most brilliantly written I've ever come across. Every single line of that song is amazing. I met a woman, she had a mouth like yours she knew your life... she knew your devils and your deeds and she said "Go to him, stay with him if you can, but be prepared to bleed..." Brilliant.