What is your idea of an excellent progressive rock instrumental?!

What is your idea of an excellent progressive rock instrumental?

"La Villa Strangiato"

2 weeks ago
.... quite the charmer.

Any of these are great representatives:

"YYZ" - Rush
"Tank" - Emerson, Lake, & Palmer
"Erotomaina" - Dream Theater
"The Mad Data Race" - Spastic Ink
"Erotic Nightmares" - Steve Vai
"The Dance Of Eternity" - Dream Theater
"Dancing Mad" - Nobuo Uematsu/The Black Mages
"Birds of Fire" - The Mahavishnu Orchestra
"The Barbarian" - Emerson, Lake, & Palmer
"Peaches En Regalia" - Frank Zappa