This is the oldest known song, A Sumerian hymn from 1400 BCE.

This is based on the Dr. Richard Dumbrill interpretation, arranged by Clint Goss



It's essentially a melody that has a bass accompaniment, however the bass part just alternates between a low B
(B2), and a high B (B3), so I tuned my A string up a whole step to a B, and my low E string down a fourth to a
B, so my guitar was tuned to B-B-D-G-b-e, therefore allowing you to just alternate between the open strings for 
the bassline.
   !!Disclaimer!!
Always be careful tuning strings up! 


Also, it switches between 4/4, 3/4, and 2/4 almost constantly, so don't be confused 
by the uneven measure lengths


-------------------------------------------------------------------------------
                             Hurrian Hymn No. 6
-------------------------------------------------------------------------------
Tabbed by: Lambo


Tuning: B-B-D-G-b-e

   e e e e h+       e e e e q    e e e e h+       e e e e q  e e
e|-2-0-----------|-------------|-2-0-----------|-----------------|
B|-----3-2-0-----|-(0)--0-2-3--|-----3-2-0-----|-(0)----0-2--2-3-|
G|---------------|-------------|---------------|------2----------|
D|---------------|-------------|---------------|-----------------|
B|---------------|-------------|------------0--|--0-------0------|
B|------------0--|----------0--|---------0-----|-----------------|
   h.         q     h       q    h       q  q     q   q   q  q


   s s s s s s s s s s s s s s s s   s s s s s s s s s s s s s s s s   s s s s s s s s
e|-0-2-0-2-0-2-0-2-0-2-0-2-0-2-0-2-|-0-2-0-2-0-2-0-2-0-2-0-2-0-2-0-2-|-0-2-0-2-0-2-0-2-|
B|---------------------------------|---------------------------------|-----------------|
G|---------------------------------|---------------------------------|-----------------|
D|---------------------------------|---------------------------------|-----------------|
B|-----0-------0-------0-------0---|-----0-------0-------0-------0---|-----0-------0---|
B|-0-------0-------0-------0-------|-0-------0-------0-------0-------|-0-------0-------|
   e   e   e   e   e   e   e   e     e   e   e   e   e   e   e   e     e   e   e   e

   e e e e e e e e   q  e e h      e e q   e e h       e e q    e e h       e e q
e|-2-0-------------|------0-2----|-----0-|-----------|--------|-----------|--------|
B|-----3-2-2-0-----|----3--------|-2-3---|-0-2-3-----|---0-2--|-----0-----|---0-2--|
G|-------------2---|-------------|-------|-----------|-2------|---2-------|-2------|
D|---------------4-|-------------|-------|-----------|--------|-4---------|--------|
B|-----------------|-----------0-|-------|--------0--|--------|--------0--|--------|
B|-0---------------|-0------0----|-----0-|-----0-----|-----0--|-----0-----|-----0--|
   q   h.            q      q  q   q   q   q   q  q    q   q    q   q  q    q   q


   e e e e q    e e h       e e q    e e e e q    e e q    e e h       e e q    e e h       e e q    e e h
e|-2-0--------|-----------|--------|-0----------|-0-2-4--|---0-2-----|-----0--|-----------|--------|----------|
B|-----3-2-0--|---0-2-----|-----0--|---3-2-0----|--------|-3---------|-2-3----|-0-2-3-----|---0-2--|-----0----|
G|------------|-2---------|---2----|---------2--|--------|-----------|--------|-----------|-2------|---2------|
D|------------|-----------|-4------|------------|--------|-----------|--------|-----------|--------|-4--------|
B|------------|--------0--|--------|------------|--------|--------0--|--------|--------0--|--------|--------0-|
B|---------0--|-----0-----|-----0--|---------0--|-----0--|-----0-----|-----0--|-----0-----|-----0--|-----0----|
   h       q    q   q  q    q   q    h       q    q   q    q   q  q    q   q    q   q  q    q   q    q   q  q

   e e e e q    e e h       e e q    e e h       e e q    e e h       e e q    e e h
e|-0----------|---0-2-----|-----0--|---0-2-----|-----0--|---0-2-----|-----0--|-----------|
B|---3-2-0----|-3---------|-2-3----|-3---------|-2-3----|-3---------|-2-3----|-0-2-3-----|
G|---------2--|-----------|--------|-----------|--------|-----------|--------|-----------|
D|------------|-----------|--------|-----------|--------|-----------|--------|-----------|
B|------------|--------0--|--------|--------0--|--------|--------0--|--------|--------0--|
B|---------0--|-----0-----|-----0--|-----0-----|-----0--|-----0-----|-----0--|-----0-----|
   h       q    q   q  q    q   q    q   q  q    q   q    q   q  q    q   q    q   q  q

   e e e e q    e e e e h       e e e e q
e|-0----------|-2-0-----------|-0----------|
B|---3-2-0----|-----3-2-0-----|---3-2-0----|
G|---------2--|---------------|---------2--|
D|------------|---------------|------------|
B|------------|------------0--|------------|
B|---------0--|---------0-----|---------0--|
   h       q    h       q  q    h       q

And repeat. Or improvise on this. Not sure how the Sumerians would've done it, but there's several 
interpretations along those lines on the web.