SBS "Challenge 1000 Songs" featured two major singers from the idol world, SISTAR Hyorin and Ailee, going head to head.

Themed the 'Family Episode,' there were a lot of different singers spanning many generations, which drew the interest of viewers. 

SISTAR Hyorin, who is being touted to be the #1 vocal idol, went up against 'Singing Diva' Ailee. Neither of the singers let their guards down and people say that the two singers gave the performance their all, reaching out to the listeners' sentiments and showing off their singing abilities. 

The other singers on this episode included Tae Jin Ah, Eru, Ailee, Mighty Mouth, Sung Jin Woo, Maya and Super Junior.