 Some of Alkan 's music gives hints of the <unk> which some have detected in his personality . The Chant Op. 38 , no . 2 , entitled <unk> , repeats the note of its title incessantly ( in total 414 times ) against shifting harmonies which make it " cut ... into the texture with the ruthless precision of a laser beam . " In modelling his five sets of Chants on the first book of Mendelssohn 's Songs Without Words , Alkan ensured that the pieces in each of his sets followed precisely the same key signatures , and even the moods , of the original . Alkan was <unk> in his <unk> spelling , occasionally <unk> to keys containing double @-@ <unk> or double @-@ flats , so pianists are occasionally required to come to terms with unusual keys such as E @-@ sharp major , <unk> equivalent to F major , and the occasional triple @-@ sharp . 
