what I noticed is how I started analyzing pieces of the songs, like what kind of bass-playing fits best with a certain melody, should it be constant or funky, should it give emphasis on certain parts or be the solid foundation that drives the song; but most of all 'what goal/feeling/ambiance do you want to create with the song.
my other band members don't analyze as much as I do, they just play what they think sounds good, but I love analyzing and composing (though I've just started :p)
= good music is good drinking =