He sings : "Haji Firuz eh....sali ye ruz eh"
Hâjji Fîrûz or Hajji Piruz, is the traditional herald of Nowruz. He is a black-faced character clad in bright red clothes and a felt hat. While ushering in Nowruz, Hajji Firuz plays a tambourine and sings "Haji Firuz eh, sali ye ruz eh" (It is Haji Firuz time, It happens one day in a year). People of all ages gather around him and his troupe of musicians and listen to them play the drum, saz or kamancheh, and dance. to know the history please click here.
Text by wikipedia
While I was watching Hajji Firuz in the street, I just thought that "how we could live with out such symbols in our culture?! " I really can not suppose the new year with no Hajji Firuz!