Flute Quintet, Op. 21,"Christmas Quintet" - I. And there were shepherds abiding in the field, keeping watch over their flock by night. (长笛五重奏，Op. 21《圣诞五重奏》 - 第一乐章 牧羊人在田野里按着更次看守羊群) (Arr. G. Hinze)