"Rosmersholm" has long been considered one of Ibsen's more difficult works.

It is also considered to be among the most technically difficult works for violin.

In spite of this, larger and more difficult works can be found in his output.

Thanks to the music teacher of the school, the pupils tackled difficult works.

His compositions have been called "some of the finest and most difficult works in the American march repertoire."

These are probably the most jarring and difficult works he ever produced, though they were catalysts for the rest of his art.

The real problem was how to train the choir to sing these difficult works.

I'm not saying that the instrument makes difficult works easy to play.

"But you would need two or three years to find the singers and rehearse; these are very, very difficult works."

He knew that she was probably the only singer who could technically handle the difficult works Petiron wrote.