Listen to O-Town's High School-Inspired #TBT Mixtape

Erik Johnson

The boy band is back with new single "Hello World," featuring "Bachelor" star Colton Underwood.

Welcome to #TBT Mixtape, Billboard's series that showcases artists' very own throwback-themed playlists exclusive to Billboard's Spotify account. The curated set features the artists' favorite tracks from their youth and childhood.

This week's spin comes from O-Town. The 2000-era boy band favorites (and MTV's Making the Band alums) netted two hits on the Billboard Hot 100 with their breakthrough “Liquid Dreams," which peaked at No. 10, and follow-up “All or Nothing,” which reached No. 3 back in 2001. The band's debut self-titled album was also certified platinum in both the U.S. and Canada.

In the spirit of the recent boy band renaissance of recent years, the group -- sans former frontman Ashley Parker Angel -- dropped their latest single "Hello World," with a surprise guest feature from former NFL player and The Bachelor star Colton Underwood. The track -- released via Pacific Records -- precedes a forthcoming comeback LP for the pop group, which will be split into two EPs. All proceeds of the single will benefit the Colton Underwood Legacy Foundation, which raises money and supports research initiatives for cystic fibrosis.

"They are so great to be using this song to help raise funds for the Legacy Foundation and I know it’s going to be big!" Underwood says of the track. "It’s an anthem for anyone to live your best life. It’s not only for the Cystic Fibrosis warriors, but for anyone out there dealing with anything in life.”

To further fete their new era, O-Town are looking back to their heyday with this week's #TBT Mixtape -- an ode to the band's high school mixes and shared love of all things '80s and '90s, featuring cuts by LL Cool J, Blackstreet, *NSYNC, LFO and more.

"We’re '80s kids, so we were really inspired by, and loved, the music of the '90s and the artists on this list," O-Town's Jacob Underwood tells Billboard. "Hopefully these songs bring you back to your early memories where life was simple and fun." Adds bandmate Trevor Penick: "Every one of these songs is still on rotation on my iPod. I absolutely love the music of the '90s and don’t think theres been a more fun time to be a music fan."

Listen to the playlist and also check out some retro snaps of the group below. Also catch O-Town on their “Pop 2000” tour with dates alongside Ryan Cabrera, Lance Bass, Aaron Carter and Tyler Hilton.