Janos Gereben in the San Francisco Classical Voice

... Mahler was not known for cost-efficient planning, so he thought nothing of having some 100 singers — women of Ragnar Bohlin's SFS Chorus and Susan McMane's San Francisco Girls Chorus — sit for over an hour before singing angelically in the brief "What the Angels Tell Me" movement, and then cease because, as Bruno Walter said of the last movement, "words are stilled, for what language can utter heavenly love more powerfully and forcefully than music itself?" ...