This is actually an arrangement of a christmas carol that is very popular in Finland, "Kuului laulu enkelten". It is strongly related to the "Gloria in excelsis deo". You find my arrangement (lute tabulature in pdf) and some more carols in page cs.helsinki.fi/u/wikla/mus/10_courseLute/Carols/ . The lute is "Andreas Berr, Vienna, 1699" by Stephen Barber 1986. Arto Wikla 15.12.2008.