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