Watch Man Play Beatles' 'Yesterday' on Guitar During Brain Surgery

Brazilian bank worker Anthony Kulkamp Dias strums and croons iconic 1965 ballad during surgery to remove brain tumor

The Beatles' iconic ballad "Yesterday" is one of most covered songs in music history – but even Paul McCartney would tip his hat to Anthony Kulkamp Dias, the 33-year-old Brazilian bank worker who strummed out the Help! anthem while undergoing a brain-tumor–removal surgery. "I played six songs at certain times," Dias told Brazilian news site G1 (via Telegraph). "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."

He drowsily croons and strums out simplified chords to "Yesterday" – which Rolling Stone ranked the 13th greatest song of all-time – in the above clip, resting an acoustic guitar on his stomach as the surgeons perform their complicated task. Dias, a professional musician for two decades, performed an array of material, including a song ("Emanuel") that he wrote for his newborn son. Not only was the music not a distraction for the surgery team – they even issued requests. "The doctors asked me to repeat one of the country songs, so I even had an encore," the musician told G1.

Dias underwent innovative surgery that allowed doctors to safely map the awake patient's brain – a technique that helps prevent injuries during the operation. "By keeping [him] awake during surgery, these areas can be monitored in real time," said Dr. Jean Abreu Machado, clinical director for Nossa Senhora da Conceição hospital. "It really is a great challenge for the whole surgery team, including the anesthetist.”

The patient was scheduled to be discharged on Wednesday – armed with his health, an incredible viral video and lifetime bragging rights.