I never found any tab for the harmonica intro so here it is.
Made by ear so it's probably wrong, sorry.
Still, it works great for me :)
I'd say that on my classical guitar, this sounds crappy, but with an
electric guitar (which allows the long notes to last so you can still hear
it after a while) it may sounds good :D

Please rate so I know if I must go on with The Great Gig In The Sky's voice
solo by ear, thanks!

By the way, the dots (".") means "and a half", so "9." means , in fact,
"9 1/2".

e|-----------------------|-----------------|
B|-6h7-8b(9-8-9.-8-9.-8)-|-6/7-8.b(9-8-9.)-|
G|-----------------------|-----------------|
D|-----------------------|-----------------|
A|-----------------------|-----------------|
E|-----------------------|-----------------|

e|--------------------------------------------------------------|
B|-7-8-9.b(10-9-10-9-10-9-10-9-10-9-10-9-10-9-10-9-10-9-10-9)/8-|
G|--------------------------------------------------------------|
D|--------------------------------------------------------------|
A|--------------------------------------------------------------|
E|--------------------------------------------------------------|

e|-----------|------------------------------|
B|-8-8-8-8/9-|-9/10-11.b(12-11-12-11)-11/10-|
G|-----------|------------------------------|
D|-----------|------------------------------|
A|-----------|------------------------------|
E|-----------|------------------------------|

e|------------------------------|------------------------------------||
B|-8/9-10.b(11-10-11-10)-9/8-8~-|-8/9b(10-9-10-9)-9-9b(9.-9-9.)-9-8~-||
G|------------------------------|------------------------------------||
D|------------------------------|------------------------------------||
A|------------------------------|------------------------------------||
E|------------------------------|------------------------------------||

There ya go! ^^
Have a nice day! :D