Costello will perform songs from The Secret Arias at the Copenhagen Opera House this fall, and the complete work will premiere in the venue's smaller, 200-seat theater in 2006.
The pop singer has a longstanding interest in classical music, and has recorded with Brodsky String Quartet and mezzo-soprano Anne Sofie von Otter. His first full-scale orchestral work, Il sogno, premiered in Italy in 2000 and was heard at the 2004 Lincoln Center Festival.