This is the version for a Fanfare Band.
Avalon is a one-part composition. The surprising opening measures
describe the sudden entrance into another world. After these initial
measures, we hear a choral-like melody, which is repeated three times
in different instrumentations with increasing intensity. This
represents the procession of the ghosts dwelling in the underworld of
Avalon, headed by the mighty magician Merlin.
The exalted sound is then suddenly interrupted by a fast movement, in
which ostinato figures alternate with bi-tonal motives. This represents
the attempt of some evil characters to invade Avalon. Mordred is the
leader of this horde and together they disturb the peace and quiet in
the otherwise calm Avalon. The flourish of trumpets heralds the
entrance of the Knights of the Round Table who drive away the intruders
and return to their castle, Tintagel, in a triumphal procession. Upon
their return, the next problem presents itself. An inexplicable disease
plagues the resting ghosts.
The Knights and the Council of the Wise are convened to find out the
cause of this problem. Musically this can be heard in the repetition of
the initial themes. The Knights and the Council of the Wise determine
that the presence of mortals is the reason that the resting ghosts are
suffering. There is simply no room for mortal souls in Avalon. After a
powerful statement by King Arthur, we hear a glissando referring to the
very first measures, and... we are back in the normal world. The journey
through the underworld has come to an end and a dream is over.
(source: http://www.janvanderroost.com/compositions/band_works/concert_band/avalon)