On the album Procol Harum (1967), also known in Italy as Fortuna

The composition is based around a simple four chords progression: C minor; A flat/Eb; D minor seven flat five; G, the middle part comes from the Prelude 1 in C Major of Bach's Well Tempered Clavier Bach but the last bar played has been modified.

"D minor seven flat five" is basically an F minor chord over a D bass, the G is also often played as G7.

Starting in the 90's Procol Harum started to add a definite bass pattern near the end of the song, also doubled by the piano at some point.
Since the late '60s Matthew Fisher started to play a somewhat variable organ pattern near the end.

Bass pattern near the end: C D Eb C | Eb F G EB | D Eb F Ab | G Eb D C
Organ pattern near the end: CM Fm/D Eb Cm | Ab/Eb Bb/F Cm/G Ab/Eb | Fm/D Cm/Eb Bb/F Ab | G Fm Eb Fm/D

Bassline and chords (based on the original version on the symphonic one and on the recent live versions)

Piano Part: modified prelude in C major

Several versions seen side by side


Online resources

Early studio version (1967)

Original Version (1967)

Fillmore West 1967

Easter Island 1969

"POP2" TV version, with the whole prelude (1971, with video)

San Francisco 1991 (with Tim Renwick on guitar)

Edmonton II 1992 (with video)

Symphonic Version (1995, on the album The Long Goodbye - Symphonic Music Of Procol Harum)

Barbican 1996 (con orchestra)

Manchester 2001 (with orchestra)

Sopot 2001

Aarhus 2001

Horsens 2001

Copenhagen 2001 (with video)

Copenhagen 2005


Recommended versions not readily available online

New York (1969)

Napoli (2003)


Sormorock Versions

Gilgamesh Torino 2011 (with an unknown guest guitar player, with video)

Jazz Club 2012 (with Alfredo Ponissi, Mauro Roasio and Antonio Costa Barbé)

Neruda Torino 2013 (with Alfredo Ponissi)

Wuppertal 2013 (Jack Ponissi with the Palers' Band, improvised on the spot with Procol's own Geoff Withehorn); Different take (both with video)

Corner House 2013 (with video; with a longer piano solo)

Galliate 2013 (with Geoff Withehorn and Antonio Costa Barbé on Organ)