2 sentences for 羽 (yǔ — 5th note)

1. 在五音“宫商角徵羽”中，宫音居首。

   zài wǔ​yīn“ gōng shāng jué zhǐ yǔ” zhōng, gōng​yīn jū​shǒu.

   Among the five notes 'Gong, Shang, Jue, Zhi, Yu', Gong is the first.

   Source: Dong Chinese Dictionary

2. 这首曲子的主音是羽，听起来有一种淡淡的忧伤。

   zhè shǒu qǔ​zi de zhǔ​yīn shì yǔ, tīng qi​lai yǒu yī zhǒng dàn​dàn de yōu​shāng.

   The tonic of this piece is 'Yu,' and it carries a faint sense of melancholy.

   Source: Dong Chinese Dictionary