They really like operas by Wagner and French classical music. They will stop screaming for attention if you play a disk for them, but not if you play the same disk for multiple days in a row. The cockatiels have standards, after all. Conner is passionate about Brahms. They both enjoy the Ring and Ravel.
They strongly disapprove of violins and piano music, though, so don't play that type of music for your cockatiels unless you're prepared for a revolt.
Here's Conner trying to sing opera.
This could be a huge discovery for all bird owners. Play opera! See how they like it.