After Troilus and PERSON@1 , PERSON@2 returned to orchestral music , composing in rapid succession the Cello Concerto -LRB- NUMBER@1 -RRB- , the Symphony No. NUMBER@2 -LRB- NUMBER@3 -RRB- , and his masterpiece of the post-war period , the Variations on a Theme by PERSON@3 -LRB- NUMBER@4 -RRB- .

PERSON@2 then started to write more orchestral music : the Cello Concerto -LRB- NUMBER@1 -RRB- , the Symphony No. NUMBER@2 -LRB- NUMBER@3 -RRB- , and the Variations on a Theme by PERSON@3 -LRB- NUMBER@4 -RRB- .
