Tim McGraw and Tyler Hubbard Singing Together at Joe Biden Inauguration TV Special

Tim McGraw and Tyler Hubbard will join a slew of other stars at Wednesday night's primetime TV special after Joe Biden is sworn-in as president, organizers tell PEOPLE exclusively.

The country stars are expected to sing their new song "Undivided" — a message, as Hubbard said, of ever-more-important unity (and a parallel with Biden's own campaign).

Speaking with CBS This Morning last week, Hubbard, 33, (one half of Florida Georgia Line) said that when he learned of the deadly insurrection at the U.S. Capitol this month, "I thought, 'Man, I thought we needed this message last year.' "

"I didn't think we could need it anymore than we needed it last year, but apparently we still do," he said then.

"The capitol thing [is] something that I don't know that I've processed well enough to even put into words yet," McGraw, 53, also told CBS This Morning. "It was so sad and so profound and something that I never thought I would see in this country."

"But the song, it speaks to more of the social contract that we have with each other," he added. "It's not about politics, it's about how we're supposed to treat each other."

In addition to McGraw and Hubbard, Black Pumas will perform and Luis Fonsi and Ozuna will appear as part of a special edition of DJ Cassidy's Pass the Mic, inaugural organizers said Tuesday.

The unprecedented inauguration of Biden and Vice President-elect Kamala Harris — amid a pandemic and massively heightened security after the rioting — will be followed by the primetime TV special hosted by Tom Hanks, in lieu of the usual nightly glitz and glamour, in what the inaugural team is calling a "capstone" to "showcase the American people's resilience, heroism, and unified commitment to coming together."

The 90-minute program will air on the major broadcast and cable news networks, except for Fox, who is streaming it instead, according to a news release from the inauguration team.

The special will include remarks by both Biden, 78, and Harris, 56, as well as celebrity performances.

Ant Clemons, Jon Bon Jovi, Demi Lovato and Justin Timberlake will all appear, as will Lin-Manuel Miranda, John Legend, Bruce Springsteen and others.

What's more, the special will spotlight ordinary people "who have stepped up in their communities," including a delivery man, an 8-year-old boy and a kindergarten teacher .

Clemons and Timberlake will sing their "Better Days," which they wrote.

Timberlake said on the Today show on Wednesday that he was "incredibly excited" by the opportunity, calling it an "honor."

"We got the phone call to be asked for that and I was like, 'Uhh yes,' " he said jokingly.

The inauguration special "Celebrating America" airs Wednesday (8:30 p.m. ET) on ABC, CBS, CNN, MSNBC and NBC as well as online via Facebook, Twitter, YouTube and others.