"Moment", is one of the official soundtrack of the korean drama entitled "The Heirs". The artist behind the song is Changmin which is a member of the South Korean four-member ballad band, 2AM. The Heirs (상속자들), also known as The Inheritors, is a South Korean television series starring Lee Min-ho and Park Shin-hye. Written by Kim Eun-sook, the trendy drama is set in a high school populated by the privileged and uber-rich. It aired on SBS from October 9 to December 12, 2013 on Wednesdays and Thursdays at 22:00 for 20 episodes.
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Note: Please remember that "very low notes" [e.g A(low), B(low), etc] are impossible to play in normal wind instrument especially to recorders or bamboo flutes. To play it, you must switch them to a higher octave. For example:
Hope this helps :)