I'm afraid King Biscuit Time is by another Sonny Boy Williamson (Rice Miller, or Sonny Boy Williamson #2) with others (Robert Jr. Lockwood?). I have that album, but it is now missing somewhere in my house. The lyrics above are by #1, who died in 1948. Both were harpists, though. If you want #2's lyrics, click HERE and HERE. And, more than 20 of #2's songs are transcribed in Jeff Todd Titon, Downhome Blues Lyrics (University of Illinois Press, 1981).