I discover this music during a trip to Vienna at the Secession museum some years ago. It was used by british artist Mark Wallinger (Turner Prize winner,2007) for his video « Threshold to the Kingdom (2000) », a slow motion video of people coming through automatic double doors at an airport (London’s international, but could be anywhere else).
The music is a 1980 recording of Gregorio Allegri’s « Miserere mei, Deus » by the famous Tallis Scholars.
Mesmerizing…
NB: « Threshold to the Kingdom » could be seen here, recorded by a fan