 Alkan 's publications for organ or pédalier commenced with his Benedictus , Op. 54 ( 1859 ) . In the same year he published a set of very spare and simple preludes in the eight Gregorian modes ( 1859 , without opus number ) , which , in Smith 's opinion , " seem to stand outside the barriers of time and space " , and which he believes reveal " Alkan 's essential spiritual modesty . " These were followed by pieces such as the 13 Prières ( Prayers ) , Op. 64 ( 1865 ) , and the Impromptu sur le Choral de Luther " Un fort rempart est notre Dieu " , op . 69 ( 1866 ) . Alkan also issued a book of 12 studies for the pedalboard alone ( no opus number , 1866 ) and the Bombardo @-@ carillon for pedalboard duet ( four feet ) of 1872 . 
 Alkan <a href='null_genetive' title='1'><mark>'s</mark></a>publications for organ or pédalier commenced with his Benedictus , Op. 54 ( 1859 ) . In the same year he published a set of very spare and simple preludes in the eight Gregorian modes ( 1859 , without opus number ) , which , in Smith <a href='null_genetive' title='2'><mark>'s</mark></a>opinion , " seem to stand outside the barriers of time and space " , and which he <a href='uninflect' title='3'><mark>believes</mark></a> reveal " Alkan <a href='null_genetive' title='4'><mark>'s</mark></a>essential spiritual modesty . " These <a href='uninflect' title='5'><mark>were</mark></a> followed by pieces such as the 13 Prières ( Prayers ) , Op. 64 ( 1865 ) , and the Impromptu sur le Choral de Luther " Un fort rempart est notre Dieu " , op . 69 ( 1866 ) . Alkan also issued a book of 12 studies for the pedalboard alone ( no opus number , 1866 ) and the Bombardo @-@ carillon for pedalboard duet ( four feet ) of 1872 . 
Alkan  publications fa organ or pédalier commenced with his Benedictus , Op. 54 ( 1859 ) . In da same year he published a set of very spare and simple preludes in tdaeight Gregorian modes ( 1859 , without opus number ) , which , in Smith  opinion , " seem to stand outside the barriers of time and space " , and which he believe reveal " Alkan  essential spiritual modesty . " These was followed by pieces such as the 13 Prières ( Prayers ) , Op. 64 ( 1865 ) , and the Impromptu sur le Choral de Luther " Un fort rempart est notre Dieu " , op . 69 ( 1866 ) . Alkan also issued a book of 12 studies ffirthe pedalboard alone ( no opus number , 1866 ) and the Bombardo @-@ carillon for pedalboard duet ( 4 feet ) of 1872 .