There are few works in the cello repertoire as significant as the Etudes by David Popper.
Auditions for such things as youth orchestras, festivals, competitions, or university admissions frequently require the performance of one or more.
This has been the case since their publication, and there is no sign that this is going to change in the foreseeable future.
They are practiced, studied, and learned by cellists all over the world as a sort of rite of passage to the advanced cello techniques.
There are few works in the cello repertoire as significant as the Etudes by David Popper