08-01-2011, 08:20
A 50-50 split would be reasonable and won't lead to problems later on. As for credits - something like - Song A (Lars-Mars) or whoever the other person is. Although you wrote the melody he contributed the harmony (if I understand you correctly) so he must be credited as being a co-writer. And remember there's a good chance that you might write together again so you have to keep the peace. You would get a separate credit for the lyrics. So all in all - a 60-40 split in your favour would be acceptable. Just an opinion and not a rule.