新音楽時報
Joachim had extensive correspondence with both Clara and Brahms, as Brahms greatly valued Joachim's opinion of his new compositions. In 1860 Brahms and Joachim jointly wrote a manifesto against the "progressive" music of the 'New German' School, in reaction to the polemics of Brendel's "Neue Zeitschrift für Musik". This manifesto, a volley in the War of the Romantics, had originally few (four) signers (more later) and met with a mixed reception, being heavily derided by followers of Wagner.