Next month the 50th volume in the Now That's What I Call Music! U.S. series will be released. It's hard for me to believe there have now been 50 of these albums. I distinctly remember when the first one was released in 1998. What was on it?

The Now That's What I Call Music series originated in the U.K. and Ireland in 1983, and on October 27, 1998 the original U.S. Now album was released. Here's the track listing and look back.

Together Again - Janet Jackson

As Long as You Love Me - Backstreet Boys

The Way - Fastball

Flagpole Sitta - Harvey Danger

Say You'll Be There - Spice Girls

All My Life - K-Ci & JoJo

Never EverAll Saints

If You Could Only See - Tonic

Mmmbop - Hanson

Zoot Suit Riot - Cherry Poppin' Daddies

Shorty (You Keep Playin' with My Mind) - Imajin

Anytime - Brian McKnight

Barbie Girl - Aqua

Karma Police - Radiohead

I Will Buy You a New Life - Everclear

Fly Away - Lenny Kravitz

Sex & Candy - Marcy Playground

NOW 50 will debut on Tuesday May 6th featuring Katy Perry's 'Dark Horse,' Pharrell Williams' 'Happy,' and more.

Here's the full track list:

Pharrell Williams, "Happy"
Katy Perry w/ Juicy J, "Dark Horse"
Aloe Blacc, "The Man"
Avicii, "Hey Brother"
Bastille, "Pompeii"
Lorde, "Team"
Jason Derulo (featuring 2 Chainz), "Talk Dirty"
The Chainsmokers, "#Selfie"
DJ Snake & Lil Jon, "Turn Down For What"
Kid Ink w/ Chris Brown, "Show Me"
Naughty Boy w/ Sam Smith, "La La La"
Bruno Mars, "Young Girls"
Miley Cyrus, "Adore You"
John Legend, "All Of Me"
Passenger, "Let Her Go"
American Authors, "Best Day Of My Life"

Bonus tracks:

Mary Lambert, "She Keeps Me Warm"
Wrabel, "Ten Feet Tall"
Foxes, "Youth"
Conway, "Big Talk"
Pia Mia, "On My Mind"

And here are the additional tracks included in the deluxe edition:

Katy Perry, "Firework"
Kelly Clarkson, "Stronger (What Doesn’t Kill You)"
Lady Gaga, "Poker Face"
Black Eyed Peas, "I Gotta Feeling"
Nelly, "Hot In Herre"
Carly Rae Jepsen, "Call Me Maybe"
Britney Spears, "...Baby One More Time"
Train, "Hey, Soul Sister"
Gotye featuring Kimbra, "Somebody That I Used To Know"
Pink w/ Nate Ruess, "Just Give Me A Reason"
Lady Antebellum, "Need You Now"
Taylor Swift, "We Are Never Ever Getting Back Together"
Plain White T’s, "Hey There Delilah"
Backstreet Boys, "As Long As You Love Me"

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