First of all, do not complain about the tuning, there's nothing I can do about it, we 
all know Sonic Youth use (almost) always odd tunings for their songs. Anyway, here's how I 
play this song with my mates.

The used tuning is:

A|-| (Standard e down 3 and a half steps)
A|-| (Standard B down 1 full step)
D|-| (Standard G down 2 and a half steps)
D|-| (Standard D)
D|-| (Standard A down 3 and a half steps)
D|-| (Standard E down one full step)

I believe the second guitar is in a slightly different tuning, either way, you can play 
this amazing song just by using this one in both guitars.


-------------------------------------------------------------------------------
                             (I GOT A) CATHOLIC BLOCK - Sonic Youth
-------------------------------------------------------------------------------
Tabbed by: Gustavo Collado
Email: ltavo_87@hotmail.com

Tuning:DDDDAA

Intro

Guitar 2 [Do some random feedback noise]

Guitar 1
A|-7*-|
A|-7*-|
D|-7*-|
D|-7*-|
D|-7*-|
D|-7*-|
*=harmonics

A|---------------|
A|-7/6/7/6/7/6r--|
D|-7/6/7/6/7/6r--|X4
D|-7/6/7/6/7/6r--|
D|---------------|
D|---------------|
r=let ring

A|--------------------------------------------|
A|--4-2---------4-2002h4--4-2---------4-2022r-|
D|-4-4-4-4-4-4-4-4-------4-4-4-4-4-4-4-4------|X2
D|--------------------------------------------|
D|--------------------------------------------|
D|--------------------------------------------|

Verse 1
(I've got a catholic block inside my head...)

Guitar 1
A|--------------------------------------------|
A|--4-2---------4-2002h4--4-2---------4-2022r-|
D|-4-4-4-4-4-4-4-4-------4-4-4-4-4-4-4-4------|X8
D|--------------------------------------------|
D|--------------------------------------------|
D|--------------------------------------------|

Guitar 2 [listen to the song to get the correct rythm]
A|---------------------------------------|
A|---------------------------------------|
D|-(4-44-4-444-4-44-4-444-777777-999999)-|X4
D|-(4-44-4-444-4-44-4-444-777777-999999)-|
D|--4-44-4-444-4-44-4-444-777777-999999--|
D|---------------------------------------|

Bridge

Guitar 1
A|--------------------33333333-|
A|-002244220022442200-33333333-|
D|-002244220022442200-00000000-|
D|-002244220022442200-00000000-|
D|-----------------------------|
D|-----------------------------|

(come back to me a while)
A|---------------|
A|---------------|
D|-11-14-12-1111-|X6
D|-11-14-12-1111-|
D|-11-14-12-1111-|
D|-11-14-12-1111-|

A|-----------------------|
A|-----------------------|
D|-666777999111111121212-|X2
D|-666777999111111121212-|
D|-666777999111111121212-|
D|-666777999111111121212-|

A|---------------|
A|---------------|
D|-11-14-12-1111-|X6
D|-11-14-12-1111-|
D|-11-14-12-1111-|
D|-11-14-12-1111-|

A|-------------|
A|-------------|
D|-------------|X8
D|-------------|
D|-------------|
D|-4-444-4-444-|

Guitar 2
A|--------------------------------------------------------|
A|--------------------------------------------------------|
D|-77777799999911111111111112121212121213-/12/13-/12/13br-|
D|-77777799999911111111111112121212121213-/12/13-/12/13br-|
D|--------------------------------------------------------|
D|--------------------------------------------------------|
b=bending
r=let ring

(come back to me a while)
A|-777-999-111111-121212-161616-|
A|-777-999-111111-121212-161616-|
D|------------------------------|X3
D|------------------------------|
D|------------------------------|
D|------------------------------|

A|-----------------------|
A|-----------------------|
D|-666777999111111121212-|X2
D|-666777999111111121212-|
D|-666777999111111121212-|
D|-666777999111111121212-|

A|-777-999-111111-121212-161616-|
A|-777-999-111111-121212-161616-|
D|------------------------------|X3
D|------------------------------|
D|------------------------------|
D|------------------------------|

[Do some noise, whatever you like, harmonics in the higher frets, feedback, wathever]

Verse 2
(I've got a catholic block, it's around my head...)

A|--------------------------------------------|
A|--4-2---------4-2002h4--4-2---------4-2022r-|
D|-4-4-4-4-4-4-4-4-------4-4-4-4-4-4-4-4------|X4
D|--------------------------------------------|
D|--------------------------------------------|
D|--------------------------------------------|

Guitar 2
A|---------------------------------------|
A|---------------------------------------|
D|-(4-44-4-444-4-44-4-444-777777-999999)-|X2
D|-(4-44-4-444-4-44-4-444-777777-999999)-|
D|--4-44-4-444-4-44-4-444-777777-999999--|
D|---------------------------------------|

Outro

Guitar 1
A|-----------------------|
A|-----------------------|
D|-666777999111111121212-|X3
D|-666777999111111121212-|
D|-666777999111111121212-|
D|-666777999111111121212-|

A|---------------------------------------|
A|---------------------------------------|
D|-666777999111111121212141414161616/22b-|
D|-666777999111111121212141414161616/22b-|
D|-666777999111111121212141414161616/22b-|
D|-666777999111111121212141414161616/22b-|

A|-------------------|
A|-------------------|
D|-0-00-4-42-22-0-00-|X4
D|-0-00-4-42-22-0-00-|
D|-0-00-0-00-00-0-00-|
D|-------------------|

Guitar 2
A|-----------------------|
A|-----------------------|
D|-666777999111111121212-|X2
D|-666777999111111121212-|
D|-666777999111111121212-|
D|-666777999111111121212-|

A|-111111121212141414161616171717-|
A|-111111121212141414161616171717-|
D|--------------------------------|
D|--------------------------------|
D|--------------------------------|
D|--------------------------------|

A|-111111121212141414161616171717191919212121b-|
A|-111111121212141414161616171717191919212121b-|
D|---------------------------------------------|
D|---------------------------------------------|
D|---------------------------------------------|
D|---------------------------------------------|

[keep on scratching the string and bending until the very end]

Well, this is it, hope it helps. Cheers mates!