Jose Carreras, now retired but oh he was so gorgeous and what a voice before it was ruined by his illness. Some say he had ruined it by singing all the wrong parts and they may be right but I fell in love with him years ago. More on him by following the link
Prague State Opera - 2 >> If you visit the opera or concerts, you'll be more comfortable in smarter dress. A jacket and tie is not essential, but wouldn't be out of place. Having said that, if you wear jeans and trainers you won't be refused entry.