Hypnosis and meditation use very similar techniques to reach a very similar state of mind. I'd say that the main difference is that people talking about meditation usually come from a spiritual viewpoint, whereas hypnosis is more scientific.
Based on your guitar and hocus-pocus comment I reckon that you know about as much about meditation (guitar or not) as a Chicken Soup For The Soul reader knows about theology.
> I'd say that the main difference
Is definitely the practices themselves.