Curved Air—Piece of Mind.  The Latin-influenced next-to-last section chugs right along for an unfortunately brief time before giving way to an understated slow section that concludes the piece.

U.K.—The Only Thing She Needs, from the same LP as Carrying No Cross, is equally propulsive.

Dinah-Moe Humm - Frank Zappa, 3:55 - 4:50. (Turn up the volume way up)

No one’s mentioned The Cinema Show!  The “Seconds Out” version especially, with the Collins/Bruford drum battle royal.

ELP had several: the last sections of The Three Fates and Tank, and the middle section of Trilogy.

The second part of You by Tony Banks, contrasting with the slow song portion.

The concluding section of For Richard by Caravan.

Caravan—All Sorts of Unmentionable Things, the last section of Dabsong Conshirtoe, which crossfades into a reprise of The Show of Our Lives.

Colosseum—Valentyne Suite.  The opening section especially, but it builds and releases energy a couple more times before it’s done.

Greenslade—Joie de Vivre.  The last section with the organ/violin duet.

Esperanto—The Rape, with its tense, panicky, continually-glancing-over-your-shoulder coda.

Flash—Lifetime.

Gentle Giant—So Sincere, the live version from Playing the Fool, with its thundering percussive extravaganza.

Happy the Man—Labyrinth.  Or the solo rerecording by Kit Watkins.  Another that speeds and slows nicely.

Hoelderlin—Phasing.  Starts out slow and builds gradually, making for excellent driving music.

It Bites—You’ll Never Go to Heaven, with Dunnery’s intense solo at the end.

Lucifer’s Friend—the middle section of Spanish Galleon.

Santana—Flame-Sky.  Another that starts slow and builds and builds.

Pat Metheny Group—The Roots of Coincidence.  One of my favorites of his.

Anthony Phillips—The Geese and the Ghost.  The closing section, where he sounds like he’s trying to wear his fingers down to the bone on his 12-string.

Refugee—Credo.  For a 3-piece, they could really do the “intense” thing.

Todd Rundgren’s Utopia—Utopia Theme.  There are 2 or 3 parts that really bust out.

Van Der Graaf Generator—Scorched Earth.  The first time I heard it I thought the end was one of the most intense things ever.

Come to think of it, several of these were in the Extended Coda thread I started a while ago.

And how about some tracks in which the whole thing proceeds at a constant or near-constant fast pace:

Love Sculpture—Sabre Dance.  Both the album version and single version (two different recordings) are about the wildest things ever recorded, and that’s no exaggeration.

Focus—Harem Scarem

Weather Report—Nubian Sundance

Jeff Beck—Scatterbrain

Jean-Luc Ponty—Enigmatic Ocean.

PFM—Celebration (live version)