3 sentences

1. 大提琴发出了深沉的琴声。

   dà​tí​qín fā​chū le shēn​chén de qín​shēng.

   The cello produced a deep, resonant sound.

   Source: Dong Chinese Dictionary

2. 屋子里面传出了一阵阵悠扬的琴声。

   wū​zi lǐ​miàn chuán​chū le yī zhèn​zhèn yōu​yáng de qín​shēng.

   The melodious sound of music drifted from the room.

   Source: Dong Chinese Dictionary

3. 她熟练地弹奏着古筝，琴声非常动听。

   tā shú​liàn de tán​zòu zhe gǔ​zhēng, qín​shēng fēi​cháng dòng​tīng.

   She played the guzheng skillfully, and the music was beautiful.

   Source: Dong Chinese Dictionary