For varying reasons:

Leona Lewis - Summertime

Sam & Nicole - And I am Telling You - I didn't watch most of this series but saw this. Nicole's vocals were insane.....the way she took over, just hilarious

Danyl Johnson's Audition

Leon & Kylie - I think I must be Leon's only fan.........when he was teamed up with Kylie, I knew he had it won.

Ray Quinn - My Way - Sharon had been a right b&&h, but even she had to praise him after this.

Oh, speaking of which - Nicole and Jahmene and their amazing duet where Nicole's mic broke and she stole his instead!

The McDonalds and 500 miles - even Simon praised them for it

I think this is worth seeing again

https://www.youtube.com/watch?v=CAKJBzE8a3A

Feel the loaf!

Little Mix - Don't Let Go

4th Impact- Bang Bang
Diana Vickers- Man in the mirror
Ella Henderson- Believe

Fleur East - Uptown Funk, Bang Bang and Lady Marmalade

Alexandra Burke - Listen, Hallelujah, Toxic

Misha B - Rolling in the Deep, Girls just wanna have fun, Who you are

Leona Lewis - I will always love you, bridge over troubled water

Luke Friend - Run an, PLay that Funky Music

Rachel Hylton - Feeling Good, And I am Telling you

Misha B - Rolling in the Deep, Tainted Love and Who You Are.
Cher Lloyd - Just Be Good To Me, Turn My Swag On, STAY, Shout and 369/Get Your Freak On.
Rachel Hylton - You Know That I'm No Good, Dirty Diana and Feelin' Good.
Fleur East - Bang Bang, Lady Marmalade and Uptown Funk.
Alexandra Burke - ANYTHING.
Stacey Solomon - ANYTHING.

Aiden Grimshaw - Mad World.
James Arthur - Sexy And I Know It, The Power Of Love and Lets Get It On.
Jamie Archer - Sex On Fire.
Marcus Collins - Reet Petite.
Matt Cardle - UNFAITHFUL FT. Rihanna!!!

Laura White:- Falling
Lucie Jones:- Sweet Child of Mine
Little Mix:- Don't Let Go
Lola Saunders:- You Make Me Feel Like a Natural Woman

All beginning with L coincidentally!!

Fleur East Uptown Funk without a shadowf a doubt,

I liked Craig coltan singing heaven

cher lloyd stay

John Adeleye - A Song For You
Lauren Murray - One Last Time
Luke Friend - Kiss From A Rose
Mason Noise - End Of The Road
Nicholas - Someone Like You
Robert - Always And Forever
Rough Copy - I Believe I Can Fly

Eton Road - Can You Feel The Love Tonight

I loved their version. That was the week they went

It was the only performance where I felt like he clicked on the show imo.

A good pick for a singer that I don't think many of us would look at for iconic moments.

It was the start though of the negative commenting from within the jury,
Gary Barlow blamed for a lack of individuality
A full clip of the song with comments:
https://www.youtube.com/watch?v=Oqstd_uREF4

Cher Lloyd - Stay
Little Mix - Don't Let Go

Well the show wanted Sam Bailey to win and they knew that Nicholas was the only one in that year that could've stopped her, so they tried to bring him down with bad judges comments.

Aiden Grimshaw - Mad World
Rhydian Roberts - Let's get the party started, Walk On, Somewhere
James Arthur - We're Young, Sexy and I Know It
Jahmene Douglas - At Last
Tabby - Sweet Child of Mine
Alexandra/Beyoncé - Listen

When you said 'Nicholas' I thought of Nicholas Dorsett (series 2). I thought 'I can't remember him singing that'

Then realised you meant McDonald