What is bass? Is it just a note an octave or two lower? Does bass hit the same notes as the regular guitar or the vocals? I know it sometimes does a different melody, but it serve its purpose and is it alright, if it just plays octaves?
Bass - emphasize chord tones

So roots, thirds, fifths, sevenths, etc etc.

There is no defined method for bass playing. Just do what sounds best and feels natural.
But octaves always feel good and natural with each other. So if I write a guitar melody and know nothing about the bass, but want to add it, will the octaves work?
It'd probably sound a bit weird if you do it throughout your tune. Figure out some chords that the guitar melody fits over, than have the bass play the root note of the chords.
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