Best song w/instrumentation

if you take the lyrics out I think  Metallicas concert with Michael Kamen and orchestra is just so, so, so, splendid.
Heavy rock music accopmanied by an orchestra.

Also all the music on Wish you were here by Floyd.

geez oh, there are so many pieces of music I love but those two will be in my top ten for arranged music

Ken

although I like mianly rock music I'm always impressed by a well executed instrumental

one of my favorites is classical gas by Mason Williams - but also apache and wipeout

but there is also genius to be found in licks, riffs and intros

I particularly like buzzsaw guitar intros - think anthrax by Gang of Four, Bela Lugosi's dead by Bauhaus, High voltage by AC DC, Holiday in Cambodia by Dead Kennedy's

I think that some of the great instrumentals in famous songs are provided by band members to the song writing team - guitarists noodling away with chops or drummers

however having had a go myself (with no very notable success) it does helps if you are able to think of the songs in terms of  the chords (you may know a bit about harmony) and the associated scales
       
in short a back to front knowledge of the instrument is key but if you are not a multi instrumentalist  theory can help