Willem Mengelberg and the Concertgebouw Orchestra, Mahler Symphony No. 4 in G Major. A 1939 radio broadcast by a conductor who knew Mahler well, took detailed notes on the composer-conductor’s interpretation of the Fourth Symphony, and wrote them into his own score of the work. The result is a performance full of extravagantly romantic gestures whose authenticity, if problematic, is almost always convincing to the ear. Not that it matters, but the sound is quite tolerable (TT).