Or, if you prefer their native tongue: Die 12 Cellisten der Berliner Philharmoniker.
There are lots of cello choirs and cello ensembles around these days, but it seems to me this was the first to become popular. And probably the best! What an awesome sound. Gabriel Faure's Pavane.
This piece was originally written for piano and choir in the late 1800s, but it is most popular in the orchestral arrangement. I think it works well for a cello choir.
On your practice sheet (or in comments below if you wish) note four observations.