well it's never easy for a Lovatic to choose fav songs of her idol but i tried sooooo here you go :)))

1-Skyscraper

Go on and try to tear me down
I will be rising from the ground
Like a skyscraper.

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2-Lightweight

Light on my heart, light on my feet
Light in your eyes I can’t even speak
Do you even know how you make me weak

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3-Besame Mucho

It was late as we ignored the time
Now I can't get this stranger off my mind
I think about him when I wear this dress
I still smell him in my hair

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4-Heart by Heart

When your soul finds the soul it was waiting for
When someone walks into your heart through an open door
When your hand finds the hand it was meant to hold
Don't let go

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5-Wildfire

I look into your sunset eyes
Waiting for the moon to rise
So I can feel your heat

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6-Warrior

Out of the ashes, I'm burning like a fire
You can save your apologies, you're nothing but a liar

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7-Fix a Heart

It's like you're pouring salt on my cuts
I just ran out of band-aids
I don't even know where to start
'Cause you can bandage the damage
You never really can fix a heart .

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8-Lionheart

And we stand together facing a war
And our love is gonna conquer it all
We are lionhearts

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9-You're My Only Shorty

Love makes me crazy, restless, dumb and paranoid
But I'll take a chance on us and hope you don't destroy my heart

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10-Nightingale

You could be my sanity
Bring me peace
Sing me to sleep
Say you'll be my nightingale

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And there are some good songs that Demi Lovato featured:

1- Nick Jonas - Avalanche ft. Demi Lovato
2-The Vamps - Somebody To You ft. Demi Lovato
3- Fall Out Boy - Irresistible ft. Demi Lovato
4- Olly Murs - Up (Official Video) ft. Demi Lovato
5-We The Kings - We'll Be A Dream ft. Demi Lovato
6- Hot Chelle Rae - Why Don't You Love Me ft. Demi Lovato

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Some great songs that Demi covered

Demi Lovato - Give Me Love (Ed Sheeran Cover)

Demi Lovato - How To Love (Lil Wayne Cover)

Demi Lovato - Take Me To Church (Hozier Cover)

Demi Lovato - Stay (Rihanna Cover)

Demi Lovato - Titanium (Sia Cover)

Demi Lovato - The House That Built Me (Miranda Lambert)

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