Well, what I have been doing lately (which may or may not be wrong) is working on head voice slides. I start at Bb4, and go down as far as I can go. My chest voice musculature was sooo much stringer than my head voice musculature, that singing anything higher than A4 was really really hard for me. SAo, for the last month or so, I walk around the house talking in head voice, doing head voice slides (or decending sirens) and then I sing songs. I figure that as I strengthen my head voice, the rest will kind of fall into place. I used to have a terrible time with A Sailormans Hymn. I couldn't even sing it all the way through. Now, I can pund it out (like I did today) all the way through in one take. It is all about building strength and coordination. SO, ind a workout program, and drill it!