If you've been writing songs for a while, it's likely your songwriting style has evolved. Of the songs you wrote years ago, which is/are the most different from the kind of songs you write now?
I don't know what mine would be, I'll have to listen back in the morning. I just thought of this at 2am and wanted to post it so i could sleep without my brain going "don't forget to make that post!"
Bonus challenge: Write a new song in your old style. Tag it #oldstyle.