This recitation of Shabad Gurbani is performed by the 14th great grandson of Bhai Mardana Ji. Note the elements of Sufi qawaalis in this rendition.
Note: Bhai Mardana accompanied Guru Nanak Sahib on all of his preaching tours. The assertion that the Hindu Bhai Bala also accompanied Guru Nanak Sahib on these tours is a complete fiction. Please research this.