We are rocking and rolling down here in South Louisiana. The people in New Orleans want to secede from us so as to join the United States, but they just do not know how efficient we can be. Having spent the day hanging drywall and now being in the midst of studying, I wanted to put up a good, fast, complete, a capella version of Bring Me Li’l Water, Silvy. My search netted this.
Lonnie Donegan rocks on Hard Traveling (hard drinking, hard gambling):
Then there are Leadbelly and John Lomax, playing themselves in a 1935 reenactment. As we know, later that year Leadbelly played the MLA convention. A newsreel and an academic convention — it just shows how famous they were.
Axé.
coldhearted scientist وداد 
Actually, this is pretty good on Silvy, although not a capella. http://www.youtube.com/watch?v=omPqDa
And of course, there is Lonnie Donegan’s version, much less reverent than other all too slow ones:
Sweet Honey in the Rock’s version is slow, but probably more realistic: