Question is what is the TOTAL cost of a master-degree study per-year?
Ummmm.... why are you asking this on an internet forum, instead of writing to schools personally and asking them directly. That's the only way you're going to get a truly accurate and useful answer. Also, be aware that tuition and fees may be quite different for EU students and non-EU students.
Also, when figuring out the total cost, do not forget to include airfare and the cost of getting a visa.
Here's the tuition and fee schedule for the Fryderyk Chopin University of Music:
chopin.edu.pl/en/wp-content/uploads/2014/03/cennik_2013-2014_angielski-marzec.pdf
It's going to cost more than 10,000 Euro in tuition alone, plus give or take 1500-2000 Euro for room. For a starving student lifestyle, he'll need about 2400 to 3000 Euro beyond that. So total cost will be 15,000 Euro a year, at least.
For a list of other state music schools in Poland with links to their websites and some further information, check out this old thread on this forum:
https://polishforums.com/archives/2005-2009/study/poland-music-27497/