I recently learned about Kate Royal's 20th century opera album called Midsummer Night. The title track Midsummer Night comes from Miss Julie, an opera by Williams Alwyns. And I must admit it took me closer towards 20th century opera and atonal music than anything else. I greatly enjoyed the preview here and the CD is available for pre-order:
http://www.youtube.com/watch?v=CzS1kQPy_1II wonder what you think about the pieces included and her interpretations.