Chopin took the new salon genre of the nocturne, invented by the Irish composer John Field, to a deeper level of sophistication. He was the first to write ballades and scherzi as individual concert pieces. He essentially established a new genre with his own set of free-standing preludes (Op. 28, published 1839). He exploited the poetic potential of the concept of the concert étude, already being developed in the 1820s and 1830s by <answer>Liszt, Clementi and Moscheles</answer>, in his two sets of studies (Op. 10 published in 1833, Op. 25 in 1837).
What three other musicians were developing the new genre?
Liszt, Clementi and Moscheles