A by Barenaked Ladies guitar tab (text):

"A" by the Barenaked Ladies
Tabbed by Sam Borchard


INTRO:
Listen to the song for the rhythm, I did my best to mark out the strumming pattern 
^=up)

     A*       C#m7
e|------5-5---4------------|
B|------5-5---5------------|
G|------6-6---4------------|  x 2
D|--5h7-7-7---6------------|
A|--5h7-7-7---4------------|
E|--5---5-5----------------|
    .   ^ .   .

     A*       C#m7             A*        C#m7
e|------5-5---4----4--4-4-X-X------5-5---4----4--4-4-X-X--|
B|------5-5---5----5--5-5-X-x------5-5---5----5--5-5-X-X--|
G|------6-6---4----4--4-4-X-X------6-6---4----4--4-4-X-X--|
D|--5h7-7-7---6----6--6-6-X-X--5h7-7-7---6----6--6-6-X-X--|
A|--5h7-7-7---4----4--4-4-X-X--5h7-7-7---4----4--4-4-X-X--|
E|--5---5-5---------------X-X--5---5-5---------------X-X--|
    .   ^ .   .    ^  . ^ . ^  .   ^ .   .    ^  . ^ . ^

     A*       C#m7             G*        Bm7
e|------5-5---4----4--4-4-X-X------3-3---2----2--2-2-X-X--|
B|------5-5---5----5--5-5-X-x------3-3---3----3--3-3-X-X--|
G|------6-6---4----4--4-4-X-X------4-4---2----2--2-2-X-X--|
D|--5h7-7-7---6----6--6-6-X-X--3h5-5-5---4----4--4-4-X-X--|
A|--5h7-7-7---4----4--4-4-X-X--3h5-5-5---2----2--2-2-X-X--|
E|--5---5-5---------------X-X--3---3-3---------------X-X--|
    .   ^ .   .    ^  . ^ . ^  .   ^ .   .    ^  . ^ . ^


This pattern is used for all of the verses.  Often on the second C#m7 they throw the 
up to fret 7 for the last two strums.

A*    C#m7                 A*           C#m7
A is for angry, which is what you are at me

A*    C#m7                 G*            Bm7
A is for adult, which is what I'll never be

A*   C#m7               A*          C#m7
A is for applesauce, my favorite meal

A*   C#m7                G*      Bm7
A is for Adam, which is how I sometimes feel;

              G*      Bm7                  E
Like I'm the only man on Earth, and I've forgotten what that's worth


A is for Arthur, he's a lovable drunk
A M & Azing, like Thelonius Monk
A is for argument, A is for apparent
A is for antagonism that's not even there and
it's just you begging for attention or something I won't even mention


CHORUS:
       D          E(7)         A       A7
And I don't even know why you keep on trying

       D           E(7)        A       A7
Like I don't even know why I keep on lying

           D            Bm        G              F#m
There are millions of people in worlds of their own

     D           A        E
And two of them can't let go

A is for algebra, I learned it in school
A is what Fonzie said, 'cause he was very cool
A is for adversary, A is for affection
A's for  arousal, you are giving me an erection
C'mon I'm trying to show affection for longer than a half an hour

[Chorus]


BRIDGE:
(I'm not totally sure on this part, but it's the best I could do)

Gm  F  Dm  Gm  Cm  Bb  Gm  Cm Dm

Gm           F
I met a woman I used to know

Dm       Gm
Long before you, long ago

Cm               Bb
All I could say, after hello

Gm              Cm     Dm
  Was "are you still single?"


A is for attitude I can't help but wield
A is for arrogance; emotional shield
A is for acting, A is for abhorrently
A is for asshole, which is what I am, how rude of me.
I owe you an apology I'm sorry

[Chorus]


Then it repeats the intro riff for a while.

Enjoy!