Lots of valid opinions here, I love a straight cover played perfectly, but I love when a band make a song their own (Hendrix version of All along the Watchtower is the pinacle of this). The most important thing is the song, even writing original material, we have a song that has a bit of an AC/DC feel to it, and the bass is mostly thumping A, a little embillishment in the chorus, but still pretty simple. I tried to make it more interesting, but nothing drove the song as well a a simple root note.