모세가 가로되 이는 승전가도 아니요 패하여 부르짖는 소리도 아니라 나의 듣기에는 노래하는 소리로다 하고
Ibn Ezra
And the word "laanot"-- is like the phrase "qol anot" (Ex. 32:18). Said Yeshua b. Yehuda: "This is Heman the son of Samuel and the Bible calls him Ezrahi because he was a native of the bards, for most bards were his children and grandchildren as it is written in Chronicles." And some say that the aleph is prosthetic and he was the son of Zerah and his brother was Ethan. And others say that Heman and Ethan were brothers whose father was called Ezrah.
Tur HaArokh
עשה לך שתי חצוצרות כסף, “make two silver trumpets for yourself!” The trumpets were to be made of silver instead of gold, in order not to remind Hashem of the golden calf each time they would be used. The sound, otherwise, would be associated with the loud noise the Israelites made when they danced around that idol. (Compare Exodus 32,18)