OK, so I just became the proud parent (servant?) of a Hohner 20-button C/G concertina. I want to play pirate songs and Irish session tunes. Ordered Gary Coover's books on Amazon. Any other advice for the beginning player? I play stringed instruments mostly, with a bit of drum and other miscellaneous, but mostly I'm a singer. So I do have some musical experience, but the concertina mystifies me. Watched some YouTube videos where they basically said, "Yeah, these buttons seem to be arranged randomly, but I have no idea why." Any guidance appreciated.