# 9 Beet Stretch

# 1 Original Version

9 Beet Stretch, by Scandinavian sound artist Leif Inge, is a piece of idea-based sound art made of Beethoven’s Ninth Symphony. The source recording […] is stretched digitally to a duration of 24 hours with no distortion or pitch shifting. The work is presented as 24-hour-long sound installation/electroacoustic concert. – Wikipedia

# 2 This Version

The source audio for this version is CD recording PILZ 44 1907-2 of Ludwig van Beethoven’s Symphony No. 9 in D minor, op. 125, Philharmonica Slavonica, dir./cond. Eugen Duvier with Soloists and Choir of the Bratislava State Opera (P) 1990 (C) 1992 PILZ GmbH, Germany.

It was implemented using a custom phase vocoder with audio input blocks of 8192 samples every 19 samples zero-padded to 262144 samples and overlap-added to the output every 432 samples.

Computation took 5.3 weeks of CPU time (0.51 weeks elapsed time) on a 16-thread desktop processor, using FFTW 3.3.10 with OpenMP.