What do you think is the greatest piece of Instrumental music?

Sleep Walk - Santo and Johnny

Mr. Moto - Agent Orange (It's a cover but it's my favourite version)

Little Martha - Allman Brothers

Embryonic Journey - Jefferson Airplane

Rude Mood - Stevie Ray Vaughan

Interstellar Overdrive - Pink Floyd

I agree with longshotsblues - best, greatest, etc. is pompous, especially in such a wide category as instrumental music. If you asked, "best song from the album" that could pass...

I choose J.S.Bach - Toccata and Fugue D Minor

Instead of the original, I am going to post two covers. They are from the same year but from significantly different parts of the world at the time. Yet they can function together as a medley. Hard to beat a piece of music that can do that. 

Orchestr Josefa Vobruby - Toccata A Fuga D Moll [CSSR 1978]

https://www.youtube.com/watch?v=PWNy5lPrwC4

Walter Murphy - Toccata And Funk In D Minor [USA 1978]

https://www.youtube.com/watch?v=DLsbHWDwNn0

https://www.youtube.com/watch?v=XO79iA4tOwY

Detektivbyrån - "Dansbanan"

https://www.youtube.com/watch?v=0UMvUwtqCqM

it only makes me put one, I mean too Nagamatzu - "Carmine (September 1986 Version), and Ulver - "Not saved"

I don't do best, greatest, etc. There is way too much. This is among my Fav.'s. https://www.youtube.com/watch?v=UKcI2mcsueM~Woodst... was epic but Tanglewood's performance a year later of "Soul Sacrifice" was the most outstanding. The arrangement notched up every musician's parts by a million. What Michael Schrieve did on a basic drum set could never be matched again by today's drummers with their 20 piece sets. ~This is what I listen to when I want to go back, get lost and set my soul free.

Hi John!  A Duke Ellington composition but beautifully performed by Charles Mingus.

Mood Indigo

https://www.youtube.com/watch?v=PhkDlvGy_84

“Jessica” - Allman Brothers Band

“YYZ” - Rush

“Bron-yr-Aur”- Led Zeppelin

“Hoedown“ - Emerson, Lake and Palmer