Musicians, I Need Marketing Advice!!

I've been a keyboardist for over 10 years, and now I'd like to use that skill to make money.

I had the idea of offering to record keyboard parts for people who needed something more added to their song, and I would email them the finished sound files. I would offer an affordable price so everyone, especially people who record at home on their PCs, would be able to use my service.

The problem is that I don't know if there's enough demand for this to justify trying to get customers. I've searched, and saw that there's some guitarists and drummers offering the same thing, but I couldn't find hardly any keyboardists.

Anyways, I put some classified ads up and offered the service for free as a test. How it works is that they email me the general melody or part they want me to record, played on whatever instrument they have at the time. I then take that, learn it, and then record it as piano, or whatever they want.

Well, I did get one response for the free offer, but it was a bit different then what I planned. He asked if I would be willing to write a part for the song that wasn't there yet (which I'm willing to do). So now, I'm wondering if maybe I should try it from that angle instead-offer to write my own part for their song (but then of course I need to set a limit on alterations).

So anyways, what do you think? The way I see it, there would be demand for this sort of thing from people who play only guitar for example, that don't need keyboard often enough to justify getting a keyboardist, but yet they have a song here and there that they wish they could add some parts to. Right now I'm offering things like organ, piano, electric piano, synths, upright bass, strings, etc, so I'm hoping that would cover a lot of the sounds people would like to have in their songs.

If I pursue this more, I want to see if I can come up with a good way to market it too. I did have an idea where I put my name and then the words "online keyboard tracks" or something similar next to it. Then, every time that I post on services like Twitter, it's like a little reminder of what I do. Then, I would just focus on general interactions, which is what networking is all about (not advertising). I would add a bunch of guitarists, and whoever else that probably isn't a keyboardist themselves.

And if you know anyone who has tried this type of thing for any length of time, let me know anything from your experience with them that may help me.

I'm hoping that I can grow a network of people that are likely to need my service at some point, and then I can get referrals from my network of online friends instead of having to put my effort into just getting customers.

So to the musicians reading this, I ask: do you think this has enough appeal for me to make some money on the side with it? Whether or not it would be worth trying seems to depend on the likelihood that someone who doesn't have a keyboardist would sometimes still need these types of instruments in their songs.