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A festive track made with two field recordings by Acclivity of Freesound.org. One is of a brass band playing 'Once in Royal David's City', recorded from a distance, with lots of ambient street noise. The other is of a church congregation singing 'Hark! The Herald Angels Sing' with pipe organ accompaniment.
The recordings were pitch-shifted and stretched with FFT, then layered together and the process repeated. The original version of this track was over 18 minutes long, but the most interesting section was its beginning in which the choral and brass sounds are barely audible above the background noise. It took quite a lot of work to simplify the track and concentrate only on the most ambiguous sounds.