The Hebrew King David is probably the most well-known of psalmwriters with the majority of the psalms, seventy-three, being attributed to his hand in Israel’s Hymnal, what is now the combined 5 books that make up what is commonly called the Old Testament book of Psalms. His son, Solomon, is known to have authored one thousand and five psalms (Melaḵim Aleph [1 Kings] 4:32) and yet only two are regarded as being penned by him in the book of Psalms. There are actually examples of psalms and psalmwriters throughout the Bible and not just in the book of Psalms: Shemot [Exodus] 15:1, Bemiḏbar [Numbers] 21:17, Deḇarim [Deuteronomy] 31:19-22, Sophetim [Judges] 5:1,Shemu'el Bět [2 Samuel] 1:17, Diḇre haYamim Bět [1 Chronicles] 6:32, Yeshayahu [Isaiah] 42:10, Yeḥezqěl [Ezekiel] 27:2, Mattithyahu [Matthew] 11:17, Galatiyim [Galatians] 4:27, and Ḥazon [Revelation] 15:13 to name only a few.
A psalmwriter is one that composes music, words, or both to be offered in personal or corporate worship. The difference between a songwriter and a psalmwriter is simple; one does it for his own personal joy and the other does it for the joy of The L-rd. I was a songwriter for twenty years. And by a work of grace I'll be writing psalms for the glory of G-d until He calls me home, amen.
The definition of psalmwriter was submitted and accepted to urbandictionary.com in 2013. Prior to this submission the only other online presence the term psalmwriter had was a book written by author Michael Sandusky.