This piece of music by Béla Bartók (1881-1945) is one of 153 progressive piano pieces in six volumes written between 1926 and 1939.
Youtube comments ...
Artingence: He was a hungarian musician.
Pianopod: I am not familiar with this composer's music,
but the more you post, the more I like it.
cubusdk: Some has pointed out that the single flat
sign in the score is an Ab and not the usual Bb
so I play some 'wrong' notes. Actually I like
the little 'mutation'... By the way, I'm sure
these little pieces would benefit from your 4th
pedal even though I have noticed it is not in
your hands any more.
PaulBartonPiano: a little masterpiece very thoughtfully and
sensitively played.
Musical Pieces 
