 
 <prompt> Wetin Chopin do to the nocturne? Based on di previous question, write a context wey contain di answer. E fit be 1 - 20 sentences. Context: <response>: Chopin carry di new salon genre of di nocturne, wey Irish composer John Field invent, go deeper level of sophistication. E be di first to write ballades and scherzi as individual concert pieces. E basically establish new genre with im own set of free-standing preludes (Op. 28, wey dem publish for 1839). E explore di poetic potential of di concept of di concert étude, wey don dey develop since 1820s and 1830s by Liszt, Clementi and Moscheles, for im two sets of studies (Op. 10 wey dem publish for 1833, Op. 25 for 1837). 