As the monumental Live Earth [ tickets ] concert gets ready to rock the world tomorrow (7/7), last-minute changes are the order of today, including the addition of a Washington, DC, show headlined by superstar country couple Garth Brooks [ tickets ] and Trisha Yearwood [ tickets ].

Republican lawmakers managed to block former Vice President Al Gore's initiatives to stage a concert on the National Mall or on the Capitol lawn, so the US installment of the seven-continent event was bumped to New Jersey's Giants Stadium, according to Reuters. However, at the last minute, the Smithsonian National Museum of the American Indian stepped in, so now there will be two US shows.

The museum, which is on the National Mall about two blocks from the Capitol, can only hold about 200 people, but video screens will reportedly be set up for larger crowds to watch the show across the street near the Capitol reflecting pool. The DC concert will be one of two free Live Earth [ tickets ] shows.

The other free show, in Rio de Janeiro, has been on-again, off-again over the last couple of days, but is currently set to go forward with acts including Lenny Kravitz [ tickets ], Macy Gray [ tickets ] and Pharrell Williams [ tickets ]. Earlier in the week, the concert was nixed over security concerns. Judge Maria Galhardo previously said the event site, Copacabana Beach, is not appropriate for huge concerts because the setting makes it difficult for police to craft a viable security plan, according to the Associated Press. While organizers convinced the judge otherwise, prosecutor Denise Tarin could still appeal before the show.

Meanwhile, an invitation to perform with Madonna [ tickets ] at the London concert was apparently worth canceling a previous engagement for Gypsy punk band Gogol Bordello [ tickets ]. Maddy extended the invitation to bandleader Eugene Hutz and violinist Sergey Ryabtsev, who canceled their gig at Scotland's T in the Park to make the Wembly Stadium show, according to Billboard.

The ambitious Live Earth event aims to bring attention to the climate crisis and get people to take action. The concerts, which will hit all seven continents over a 24-hour period, will feature more than 150 acts, from legends like Madonna, The Police [ tickets ] and Genesis [ tickets ] to contemporary headliners including Kanye West and Kelly Clarkson. Organizers expect an audience of more than 2 billion.

Live Earth will begin at Sydney's Aussie Stadium and move through shows at the Tokyo Dome; Shanghai's Oriental Pearl Tower; Johannesburg, South Africa's Cradle of Human Kind; London's Wembly Stadium; Hamburg, Germany's HSH Nordbank Arena; Rio de Janeiro, Brazil's Copacabana Beach; and the finales at New Jersey's Giants Stadium and the DC museum. The lineup for each city is listed below. A band of scientists will also perform in Antarctica, so that all seven continents are represented.

Another 6,000 satellite Live Earth events will also take place in more than 100 nations, according to a press release. Event founder Kevin Wall said the outpouring of support prompted the "Friends of Live Earth" program, which helps with events ranging from small gatherings in homes to public screenings of the main concerts.

In the US, portions of the Live Earth concert will be broadcast on the NBC network, the Spanish-language Telemundo network, the Sundance Channel, Bravo, MSNBC and Universal HD. The shows will be broadcast globally at Live Earth's website.

Live Earth lineups:

East Rutherford, NJ:
AFI
Akon
Alicia Keys
Bon Jovi
Dave Matthews Band
Fall Out Boy
John Mayer
KT Tunstall
Kanye West
Keith Urban
Kelly Clarkson
Ludacris
Melissa Etheridge
Roger Waters
Smashing Pumpkins
Taking Back Sunday
The Police

Washington, DC:
Garth Brooks [ tickets ]
Trisha Yearwood [ tickets ]

London, UK:
Beastie Boys
Black Eyed Peas
Bloc Party
Corinne Bailey Rae
Damien Rice
David Gray
Duran Duran
Foo Fighters
Genesis
James Blunt
John Legend
Kasabian
Keane
Madonna
Metallica
Paolo Nutini
Pussycat Dolls
Razorlight
Red Hot Chili Peppers
Snow Patrol
Spinal Tap
Terra Naomi

Shanghai, China:
12 Girls Band
Anthony Wong
Eason Chan
Evonne Hsu
Huang Xiao Ming
Joey
Sarah Brightman
Soler
Winnie Shin

Tokyo, Japan:
AI
Abingdon Boys School
Ai Otsuka
Ayaka
Bonnie Pink
Cocco
Genki Rockets
Kumi Koda
Linkin Park
Michael Nyman
Rihanna
Rip Slyme
Rize
UA
Yellow Magic Orchestra

Johannesburg, South Africa:
Angelique Kidjo
Baaba Maal
Danny K
Joss Stone
The Parlotones
The Soweto Gospel Choir
UB40
Vusi Mahlasela
Zola

Sydney, Australia:
Blue King Brown
Crowded House
Eskimo Joe
Ghostwriters
Jack Johnson
John Butler Trio
Missy Higgins
Paul Kelly
Sneaky Sound System
Toni Collette & The Finish
Wolfmother

Hamburg, Germany:
Chris Cornell
Enrique Iglesias
Jan Delay
Juli
Katie Melua
Lotto King Karl
Mana
Mando Diao
Michael Mittermeier
Reamonn
Roger Cicero
Sasha
Shakira
Silbermond
Snoop Dogg

Rio de Janeiro, Brazil:
Jorge Ben Jor
Jota Quest
Lenny Kravitz
MV Bill
Macy Gray
Marcelo D2
O Rappa
Pharrell
Vanessa Da Matta
Xuxa