speaking of dvorak, on page 281 of 'a history of the piano concerto' it says "extramusical events often bear directly on musical content; in this case dvorak had already begun work on the cello concerto no. 2 when her learned of the serious illness of his sister-in-law, josephina kaunitzova. as a teenager in 1865, josephina had studied piano with the composer and he fell in love with her. he composed several songs with her in mind and determined to use the melody, transformed, of one of her favorite songs 'leave me alone' (published as op. 82, #1) in the middle movement of the cello concerto. a month after his return from the united states, his former love died; the even so deeply gripped dvorak that he revised the conclusion by adding further reference to this theme, creating a most touching requiem.