The literal sense of this most obscure verse is —
“And singers as trumpeters
All my springs in Thee,
which we may paraphrase, keeping in the same line with the rest of the psalm, For such an one (celebrating his birthday, Genesis 40:20; Matthew 14:6) the singers and musicians will sing (to Zion), “All my offspring is in Thee.” Not only is it a boast to have been born in Zion, but in the genuine Hebrew spirit the boast is continued into the future generations, and the Hebrew of the Hebrews exults in addressing the sacred city as the cradle of his family.
For this figurative application of the word “springs” to posterity, comp. Psalms 68:26; Isaiah 48:1; Proverbs 5:16.