Mackenzie,

You can find the song on the Led Zepplin BBC Sessions CD. It's track 8, disk 2. There are also some other really good songs not released commercially that occasionally make it to the radio as well as some live / studio recordings done specifically for a BBC radio program. I like "Traveling Riverside Blues" and "The Girl I Love She Got Long Black Wavy Hair".

Hope this helps!

__________________
Best regards,

Naz