Psałterz Dawidów, or David's Psalter, consisting of 150 metrical texts by the great Renaissance poet Jan Kochanowski set to tunes by Mikołaj Gomółka. So highly esteemed was this collection by Poles that it has reputedly been used liturgically by both Catholics and protestants. Midi files of the tunes can be found here: Melodie na Psałterz Polski, and pdf files of the scores can be found here.
Twenty-three of these Psalms were recorded in 1996 in a collection titled, Mikolaj Gomolka Melodie Na Psalterz Polski - Melodies For The Polish Psalter, and is available from the Polish Art Center. The recording received a Fryderyk award from the Polish music industry.
Might there be possibilities for setting English translations of these Psalms to their proper tunes from David's Psalter? It is certainly worth considering.
Here are some performances from this collection below: