Producing
The things I'd offer when offering to produce (each service requires 10% net royalties of the released track)
Writing Out/Arranging
$30/hr of meeting $10 rhythm chart $20 for <5 others $40 for >5 others
During a (virtual) meeting with you (songwriter), I'd try to find out the vision you have for your song and we'd talk about various ideas we have to realize it as a complete work, whether it's the "whole vibe" of the song, or very specific nuances. After this, I can write out a few charts for the song based on what you're looking for. It'll have a rhythm section chart meant to be read as a guide but with specific cues. I can also work on arranging for various other instruments (prices may vary)
Session Playing
$20- piano track $15-bass, guitar, or drum track $10- anything else
In addition to working with you on the song development itself, I can also help as a session musician recording some of the parts of the song. I'm an experienced pianist, bassist, and vocalist, but I have quite a few instruments lying around that I have enough intermediate skill in to track a few parts: guitar (acoustic and electric), drums, ukulele, mandolin, melodica, bassoon, chimes, kalimba. *These prices are only if I worked with you on the writing/arranging also.
Mixing
$35/hr Option 1 $50/hr Option 2
I've done mixing for various groups and various styles before, including a regular contemporary ensemble, a cappella music, classical chamber music, a string orchestra, a wind ensemble, a jazz big band, and a classical chorus. We can either do this as a part of the song creation process, so the first price is if we've worked together on the song already (option 1), or you can just send a bunch of stems and references and I can do it separately from the songwriting process (option 2).