 Erik Chisholm wrote well over 100 works , including 35 orchestral works , 7 concertante works ( including a violin concerto and two piano concertos ) , 7 works for orchestra and voice or chorus , 54 piano works , 3 organ works , 43 songs , 8 choral part @-@ songs , 7 ballets , and 9 operas including one on Robert Burns . He also made several interesting arrangements by composers such as Handel and Mozart . He arranged a string orchestra version of the Symphony for Solo Piano , Op. 39 Nos. 4 – 7 by Charles @-@ Valentin Alkan , a composer still largely unknown at that time , the original of which has been said to surpass even the Transcendental Études of Franz Liszt in scale and difficulty . 
