This is a song called "A" which is based on the german standard of the concert pitch.
The concert pitch is according to the german standart exactly 440 Hz which is used to tune instruments which using this standart note system.
The song is also very long because I am pretty sure that you will like it so much that you can't get enough from it,so you don't have to push that often your replay button.
Enjoy!!!

Mp3 Download at: [ Ссылка ]

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