X Factor US Judges House - Tora Woloshin - Satisfaction

It still baffles me when I see some contestants either from Idol or any show don't know a famous song. How the heck they didn't know that song??? They're the ones who want to be a singer. They should know a massive amount of songs,especially if it's famous. Plus,the lyric of this song is not that hard to memorize,it's the same lines over and over again being repeated.