Preludes et Fugues d'apres Jean-Sebastien Bach pour orchestre de violoncelles
I see from VILLA-LOBOS: SUA OBRA, Versão 1.0 (2009) that Villa-Lobos re-arranged these cello orchestra works for a cappella choir. I'd love to hear the choral version of these pieces!
An "orchestra" of cellos
Villa-Lobos, Heitor, and Johann Sebastian Bach. 1990. Préludes et fugues d'après Jean-Sébastien Bach: pour orchestre de violoncelles. Paris: Eschig.
The parts are available for hire from Max Eschig.
These pieces are becoming more popular in performance; they've been featured in four London concerts in 2008-10.