As a songwriter myself that has recorded a few albums, I've found that I don't finish projects so much as I stop making them. How do you know when something is "done?"
That would make a great #askhubski question.
Neil Gaiman once tweeted "Novels are never completed. Just abandoned & published."
On a whim several years ago I happened to walk into an art supply shop and pick up an easel, some canvases, brushes and paint. I had a dinner party the next night and everyone had to paint something before they left. Tons of fun. So I started painting abstract stuff and that was my big conundrum. I think I got to the point where I decided I was finished with one. All the others I just kept adding and adding to. Without a deadline I would be prone to just keep working on something, making it worse and then better ad infinitum.