Well, the only thing I could advise is to find the mood that is created with the music you already have. Then, once you establish that, you can use one to compliment the other.
For example: Let's say you have a piece of music with your piano. First, figure out the mood that is established or goes along with what you have so far.
Then, work with the guitarist to go along with that mood possibly.
Or vice/versa.
But then again, it all depends on how YOU write music best. There's no one way that is the RIGHT way to make music.
But I'm only an amateur, as well. This is the best I can offer.
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