Nashville country music couple Garth Brooks and Trisha Yearwood performed at former President Jimmy Carter's funeral in Washington, D.C.

The pair paid tribute to former President Carter at his state funeral on Thursday, performing John Lennon's "Imagine."

Their close personal relationship with President Carter and his late wife Rosalynn made Brooks and Yearwood great candidates for a tribute. Together, the two couples worked for Habitat for Humanity's Carter Work Project for decades, and the late president spoke often about how much he adored Yearwood's voice. The problem was the song.