Mr Kulkamp, a bank worker, also played some Brazilian country songs during the procedure last week at the Nossa Senhora de Conceição Hospital in the southern state of Santa Catarina.
Mr Kulkamp, who played guitar professionally for 20 years, discovered the tumour 15 days after his son was born.He told Brazilian news website G1.
'I played six songs at determined moments,''My right hand was a bit weaker because that was the side that they were operating on. So I stopped and rested.'I was interspersing songs and talking with them.Playing the guitar and chatting allowed doctors to safely map Mr Kulkamp's brain while awake to avoid injury that could compromise important brain functions.