have you ever just opened up logic express without having any particular idea in mind, and improvisationally created a song from scratch?
i have learned from experience that that is not the way for me to get the best results. ultimately i perform the strongest when i write the song first and finalize the entire road map before starting the session. that's just the best way to play to my strengths. everyone is different, and i have tried both ways and i've found that it is much better for me to write first