Song: Brets Day
Artist: Flight of the conchords
Guitarist: Bret Mckenzie

      D              D/C#           Bm7            D/A
e|----2---2-2-2-2----2---2-2-2-2----2---2-2-2-2----2---2-2-2-2---------------|
B|----3---3-3-3-3----3---3-3-3-3----3---3-3-3-3----3---3-3-3-3---------------|
G|----2---2-2-2-2----2---2-2-2-2----2---2-2-2-2----2---2-2-2-2---------------|
D|----0---0-0-0-0----x---x-x-x-x----0---0-0-0-0----0---0-0-0-0---------------|
A|-------------------4---4-4-4-4----2---2-2-2-2----0---0-0-0-0---------------|
E|---------------------------------------------------------------------------|

      G              D/F#           Em             A
e|----3---3-3-3-3----2---2-2-2-2----0---0-0-0-0----0---0-0-0-0---------------|
B|----3---3-3-3-3----3---3-3-3-3----0---0-0-0-0----2---2-2-2-2---------------|
G|----0---0-0-0-0----2---2-2-2-2----0---0-0-0-0----2---2-2-2-2---------------|
D|----0---0-0-0-0----0---0-0-0-0----2---2-2-2-2----2---2-2-2-2---------------|
A|----2---2-2-2-2----x---x-x-x-x----2---2-2-2-2----0---0-0-0-0---------------|
E|----3---3-3-3-3----2---2-2-2-2----0---0-0-0-0------------------------------|

Bass Clarinet(It's best to play this on bass but it will work on guitar) 
e|---------------------------------------------------------------------------|
B|---------------------------------------------------------------------------|
G|---------------------------4-------------------------------4---------------|
D|----------------------5-7-----7---5--7--5------------5-7------7-5-7--------|
A|-----6---4---6-4---6-------------------------6----4------------------------|
E|---------------------------------------------------------------------------|

This is what Jemaine plays on bass near the end
     D      D/C#  Bm7    D/A    G      D/F#   Em    A       
G|---------------------------------------------------------------------------|
D|---------------------------------------------------------------------------|
A|---5------4-----2---------------------------------------2--4---------------|
E|-----------------------5------3------2------0------------------------------|

The final thing Jemaine plays on bass is lower than the low E on bass which 
would lead me to believe that he was using a 5 string in which case it would
be:
G|---------------------------------------------------------------------------|
D|---------------------------------------------------------------------------|
A|---5------4------2---------------------------------------------------------|
E|-----------------------5------3------2--0----------------------------------|
B|----------------------------------------------2--3-------------------------|

If you wanted to play it on a regular 4 string bass you could either play the
last two notes an octave up:
G|---------------------------------------------------------------------------|
D|---------------------------------------------------------------------------|
A|---5------4------2----------------------------4--5-------------------------|
E|-----------------------5------3------2--0----------------------------------|

Or tune down to drop Db case you would play this for the main bass riff:
    D      D/C#  Bm7    D/A    G      D/F#   Em    A       
Gb|--------------------------------------------------------------------------|
Db|--------------------------------------------------------------------------|
Ab|--6-------5-----3--------------------------------------3--5---------------|
Db|----------------------8------6------5-------3-----------------------------|

And this for the ending:
Gb|--------------------------------------------------------------------------|
Db|--------------------------------------------------------------------------|
Ab|--6-------5-----3---------------------------------------------------------|
Db|----------------------8------6------5--3-----0--1-------------------------|