 Themes from Meyerbeer 's works were used by many contemporary composers , often in the form of keyboard <unk> or fantasies . Perhaps the most elaborate and substantial of these is Franz Liszt 's monumental Fantasy and <unk> on the <unk> " Ad nos , ad <unk> <unk> " , <unk> ( 1852 ) , for organ or pédalier , based on the <unk> of the Anabaptist priests in Le prophète and dedicated to Meyerbeer . The work was also published in a version for piano duet ( <unk> ) which was much later arranged for solo piano by <unk> Busoni . 
