Released: October 18, 2013

Songwriter: Greg Kurstin Sia Katy Perry

Producer: Greg Kurstin

[Verse 1]
You’re a one-of-a-one, a one-of-a-kind
That you only find once in a lifetime
Made to fit like a fingerprint
A code that clicks open the gold mine

[Pre-Chorus 1]
They say one man’s trash is another man’s treasure
When I found you, it was all pitter-patter

[Verse 2]
Secretly, I hit the lottery
'Cause you're brighter than all of the Northern Lights
You speak to me, even in my dreams
Wouldn't let you go for even the highest price

[Pre-Chorus 2]
They say one man’s trash is another girl’s treasure
So if it’s up to me, I’m gonna keep you forever

[Chorus]
'Cause I understand you
We see eye-to-eye
Like a double rainbow in the sky
And wherever you go, so will I
'Cause a double rainbow is hard to find

[Verse 3]
Was a phenomenon when you came along
Yeah, our chemistry was more than science
It was deafening, loud like lightning
It was striking, you couldn't deny it

[Pre-Chorus 3]
They say one man’s trash is another man’s treasure
The two of us together make everything glitter

[Chorus]
'Cause I understand you
We see eye-to-eye
Like a double rainbow in the sky
And wherever you go, so will I
'Cause a double rainbow is hard to find

[Bridge]
To the bottom of the sea, I'd go to find you (Oh)
Climb the highest peak to be right beside you (Oh)
Every step I take, I'm keeping you in mind
Ooh-ooh-ooh-ooh

[Chorus]
'Cause I understand you
We see eye-to-eye
Like a double rainbow in the sky
And wherever you go (And wherever you go), so will I
'Cause a double rainbow is hard to find

[Outro]
It's hard to find
Oh, it's hard to find
Once in a lifetime
Once in a lifetime

Katy Perry

Katheryn Elizabeth “Katy” Hudson (born October 25, 1984), known by her stage name Katy Perry, is an American singer, songwriter, businesswoman, philanthropist, and actress. She was born and raised in Santa Barbara, California. Having had very little exposure to mainstream pop music in her childhood, she pursued a career in gospel music as a teen and released her debut self-titled studio album in 2001. She also recorded a second solo album in 2005, (A) Katy Perry, which was scrapped.

Afterwards, Perry (her mother’s maiden name, taken to avert confusion with Kate Hudson) reinvented herself as a party girl pop star, breaking out with 2008’s One of the Boys and the #1 hits “I Kissed a Girl” and “Hot n Cold”.

Follow-up Teenage Dream (2010) equalled Michael Jackson’s record of five chart-toppers on the same album, and made Perry even more ubiquotous in the pop landscape. Following her marriage and eventual divorce from British comedian Russell Brand, she released an updated version, Teenage The Complete Confection and concert film Katy Part of Me in 2012. She released her fourth album, Prism, in 2013, along with some standalone singles, such as “Rise”.