Boulez Solves All the Problems of Mahler's Fifth Symphony.

EMI has just reissued a broad spectrum of German conductor Otto Klemperer's recordings, including a box set of one of the composers he's most associated with: Gustav Mahler.

German conductor Wilhelm Furtwaengler is regarded as one of the greatest musicians of the 20th century, but his legacy was affected by his decision to stay in Germany during WWII. Classical music critic Lloyd Schwartz looks at how Furtwangler is seen today.

Note: Wilhelm Furtwangler's last name is typically spelled with an umlaut over the 'a' character. The npr website does not support characters with umlauts over characters. A variation of Furtwangler's name without the umlaut is spelled Furtwaengler.

He's been at the forefront of contemporary music and conducting for more than half a century. Marking his 85th birthday this spring, a number of new Boulez CDs and DVDs have been released. Classical music critic Lloyd Schwartz reviews three of the latest.