We intend to allow users to suggest new media, and in fact a section of some of the pages is intended for just waiting for this. It's coming soon.
With regard to the particualar artist you mention, I have checked and we don't appear to have her in the database. Our recommendations are not very strong with classical music yet and so our catalog it less complete for classical. It's a known problem we have, and we have this again on our planned work in the coming months. I will look into how we can improve our coverage of classical artists in the meantime.