When I gain consciousness around 4 to 6 in the morning sometimes...sometimes melodies will play almost as lucidly in mind as if they were actually playing on a speaker in the bedroom. I can passively listen to them rather than forcefully imagine them. Sometimes I will sit up and hum them into my phone recorder. Most times not. I think that phenomenon is true for a lot of people.

But that does not become the basis for making a claim that I can write music in my head. I think that there are people who can. You may be one, but I would have to see you do it to actually believe it. Until then, I am afraid, that all of this brings Brad Paisley and Jason Alexander to mind.

And the claim... in no way invalidates the claim that a good song does have to sound good to actually be a good song.

https://soundcloud.com/sunset-poet-of-texas