The word piano is short for pianoforte, a combination of the Italian words for soft and loud.

Piano（钢琴）这个词是 pianoforte（钢琴）的简称，是意大利语中“柔和”和“响亮”两个词的组合。

youdao

Gritting their teeth and breathing heavily, they expend enough energy to lift the piano, even though they are playing a gentle, soft little melody.

他们咬紧牙关，屏住呼吸，耗尽自己最大的能量使得钢琴声音变响。甚至就是在弹奏很温和的、很柔美的曲调，他们也是这么费力。

youdao

Soft music like those played on saxophone or piano is preferable in coffee houses.

咖啡厅里适宜放萨克斯管或钢琴一类的轻音乐。

youdao

Penney television ad, to a soft piano soundtrack and nostalgic images of old storefronts.

FORBES: J.C. Penney Releases Apology Ad Begging Shoppers To Come Back

Piano keys each have three strings that, when struck by a felt-covered hammer, make a musical sound. (The exceptions are the bass keys, which have either two strings or one.) Pressing the soft pedal shifts the hammers so only two of the three strings are touched, giving the piano a much softer tone.

WSJ: When Two Makes Perfect | By Byron Janis