Gareth Gates stood out as this week's star performer.
Contestants might have to wait all day before getting the chance to audition.
Extra footage of the show was shown on ITV2.
All the performers are given their own audition number.
During the auditions the singers have to sing without backing music.
There were many more bad singers than there were good ones.
The series is hosted by Ant and Dec.
The auditions were held all over the country and filmed during the summer months.
At the end of the series the winner will get a one year record contract worth £1,000,000.
Pop Idol is co produced by Talkback Thames (a Freemantle Media company) and 19 TV Productions.
If two judges want a singer to be put through to the next round and two don't then Simon Cowell has the casting vote on whether they make it or not.
The winner of the series will be decided by the public.
Pop Idol is open to anyone under the age of 25.
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