Albert Barnes Commentary 1 Chronicles 25:5

"All these were the sons of Heman the king`s seer in the words of God, to lift up the horn. And God gave to Heman fourteen sons and three daughters." — 1 Chronicles 25:5 (ASV)

To lift up the horn: Some interpret this phrase literally, suggesting that Heman and his sons played the horn during musical services. However, there is no other evidence that the horn was used in this way.

A more probable explanation is that the phrase belongs to the next clause. There, it would follow the word “God,” meaning that God, in order to “lift up the horn” of Heman (that is, to increase his dignity), gave him fourteen sons and three daughters.