I love medieval music, I listen to it while building all the time.
my favorite is probably this one
https://www.youtube.com/watch?v=HQMiLezKPNY&list=PLy_Q-5e78AnyBwA-w14rbVK5OAavY_MvN&index=29
or pretty much anything on this channel
https://www.youtube.com/channel/UCjMZjGhrFq_4llVS_x2XJ_w