Participant Ramiro Perez sprays his hair before competing during the 2012 Tango Dance World Cup in Buenos Aires, Argentina. The two-week long event offers more than 500 free dance lessons, concerts and recitals. Hundreds of professional dancers compete in the championship and teach many the eight basic steps of the dance in the city where it was born. (AP Photo/Natacha Pisarenko)

Dancers get ready backstage before competing during the 2012 Tango Dance World Cup in Buenos Aires, Argentina. The two-week long event offers more than 500 free dance lessons, concerts and recitals. Hundreds of professional dancers compete in the championship and teach many the eight basic steps of the dance in the city where it was born. (AP Photo/Natacha Pisarenko)

A dancer has her hair done backstage during the 2012 Tango Dance World Cup in Buenos Aires, Argentina. The two-week long event offers more than 500 free dance lessons, concerts and recitals. Hundreds of professional dancers compete in the championship and teach many the eight basic steps of the dance in the city where it was born. (AP Photo/Natacha Pisarenko)

A dancer combs his hair before a mirror before competing during the 2012 Tango Dance World Cup in Buenos Aires, Argentina. The two-week long event offers more than 500 free dance lessons, concerts and recitals. Hundreds of professional dancers compete in the championship and teach many the eight basic steps of the dance in the city where it was born. (AP Photo/Natacha Pisarenko)

Participants wait backstage before competing during the 2012 Tango Dance World Cup in Buenos Aires, Argentina. The two-week long event offers more than 500 free dance lessons, concerts and recitals. Hundreds of professional dancers compete in the championship and teach many the eight basic steps of the dance in the city where it was born. (AP Photo/Natacha Pisarenko)

A couple rehearses before competing at the Tango Dance World Cup 2012, salon category, in Buenos Aires, Argentina. From August 14 to 28, Buenos Aires is hosting the Tango Buenos Aires Festival and Dance World Cup 2012. Dancers from 32 countries around the world are competing in the two categories of the championship: tango Salon, with 357 couples participating and tango stage with 134 couples (AP Photo/Natacha Pisarenko).

Couples compete during the 2012 Tango Dance World Cup in Buenos Aires, Argentina. The two-week long event offers more than 500 free dance lessons, concerts and recitals. Hundreds of professional dancers compete in the championship and teach many the eight basic steps of the dance in the city where it was born. (AP Photo/Natacha Pisarenko)

Italy's dancers Eloina Martins, left, and Paolo Nelzi, second from left, among others, wait before competing during the 2012 Tango Dance World Cup in Buenos Aires, Argentina. The two-week long event offers more than 500 free dance lessons, concerts and recitals. Hundreds of professional dancers compete in the championship and teach many the eight basic steps of the dance in the city where it was born. (AP Photo/Natacha Pisarenko)

A couple competes during the Tango Dance World Cup 2012, salon category, in Buenos Aires, Argentina. The two-week long event offers more than 500 free dance lessons, concerts and recitals. Hundreds of professional dancers compete in the championship and teach many the eight basic steps of the dance in the city where it was born. (AP Photo/Natacha Pisarenko)

A couple competes during the Tango Dance World Cup 2012, salon category, in Buenos Aires, Argentina. The two-week long event offers more than 500 free dance lessons, concerts and recitals. Hundreds of professional dancers compete in the championship and teach many the eight basic steps of the dance in the city where it was born. (AP Photo/Natacha Pisarenko)

A couple dances during the opening day of the annual festival and championship in Buenos Aires, Argentina. The two-week long event offers more than 500 free dance lessons, concerts and recitals. Hundreds of professional dancers will compete in the championship and teach many the eight basic steps of the dance in the city where it was born. (AP Photo/Eduardo Di Baia)

Couples perform in front of a mirror, back, during the opening day of the annual festival and championship in Buenos Aires, Argentina. The two-week long event offers more than 500 free dance lessons, concerts and recitals. Hundreds of professional dancers will compete in the championship and teach many the eight basic steps of the dance in the city where it was born. (AP Photo/Eduardo Di Baia)

Couples dance during the opening day of the annual festival and championship in Buenos Aires, Argentina. The two-week long event offers more than 500 free dance lessons, concerts and recitals. Hundreds of professional dancers will compete in the championship and teach many the eight basic steps of the dance in the city where it was born. (AP Photo/Eduardo Di Baia)