I'm a retired machinist. I played part time in weekend bands for many years. I've always been a "hobby" recordist, recording simple songs I've written, backing tracks to jam over, etc.
My next door neighbor Harry was a weekend musician for many years also. His day job is Used Car Sales Manager for a very large Chevy dealer here in town.
He had an idea for a Jingle for the dealership. It's a simple, fun, kinda corny polka. He wrote the words and music, and asked me if I'd record it. I said sure. Harry and I performed and sang on the jingle. It took us about 4 hours for everything. I later spent about 2 hours remixing and touching it up. It ran for one minute and seventeen seconds, and I had to edit it down to one minute on the nose.
They really liked it and are going to use it in an advertising campaign. Harry brought the matter of compensation for me up to the dealership, and they agreed, but didn't get into specifics...it was like, "do you need any service on your vehicle?"

Please excuse the ignorance of my question. Like I said, I have a simple computer recording setup in the corner of my basement with Cakewalk software...no iso booths or anything.

No compensation was discussed beforehand. I have no illusions of grandeur, no ton of money or new car...but what would be fair, and leave the door open for future projects with them? Should this first one be on the house?

Arnie