The first of this composer's four piano trios notably opens in B major and ends in B minor. The A-E-F motif dominates the Double Concerto in A minor of this composer, who created a work whose movements begin "for all flesh is grass" and "blessed are they that mourn," a seven-movement piece with text from the Luther Bible. This man sought to balance his Tragic Overture with a joking work with the "Fuschlied" and "Gaudeamus igitur" songs, which celebrate student life at the University of Breslau. 
The first of this composer's four piano trios notably opens in B major and ends in B minor. The A-E-F motif dominates the Double Concerto in A minor of this composer, who created a work whose movements begin "for all flesh is grass" and "blessed are they that mourn," a seven-movement piece with text from the Luther Bible. This man sought to balance his Tragic Overture with a joking work with the "Fuschlied" and "Gaudeamus igitur" songs, which celebrate student life at the University of Breslau. For 10 points, name this German composer of the German Requiem and Academic Festival Overture. 
The first of this composer's four piano trios notably opens in B major and ends in B minor.
Johannes Brahms 