I did a lullaby session a couple of weeks ago, and it was interesting to me to see how important deep breathing was to the feel of that music.  I’ve since been playing a lot of long tones–just going for strong, deep tones that go as long as possible, in and out.  It’s a good way to achieve a deep calm.  It’s also a good way to make the sound of the harp come right from the center of your body.   I’m enjoying both the sound and the emotion of it.