Bajec-Lapajne trails off about the 2:40 mark, when he said "things start to get very interesting."
"I'm just a singer and tenor at that," Bajec-Lapajne cautioned in a comment attempting to explain his temporary silence, but "I believe he rewired my brain for a while and that was the result. I could not control my tongue anymore and could not stop phonating. It was a very weird feeling."
Doctors can be heard praising Bajec-Lapajne's singing and he is soon able to start again from the beginning.
Bajec-Lapajne said the surgery was more than a year ago and he is "doing fine, continuing my professional singing career."
A patient at Hospital Nossa Senhora da Conceicao in Tubarao, Brazil, starred in a similar viral video earlier this year featuring him playing guitar and singing songs including the Beatles' "Yesterday" while having a tumor removed.