When Lady Gaga performed the national anthem at President Biden’s swearing-in ceremony on Wednesday, it was the culmination of a years-long relationship in which the two have shared the spotlight.

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Before the inauguration, Lady Gaga said on Twitter that she was honored to sing “The Star-Spangled Banner” at Mr. Biden’s inauguration, which she called “a ceremony, a transition, a moment of change.”

In a second tweet, she added: “My intention is to acknowledge our past, be healing for our present, and passionate for a future where we work together lovingly. I will sing to the hearts of all people who live on this land.”

At the Capitol, she wore an oversized gold pin depicting a dove with an olive branch, a traditional symbol of peace, as she sang into a golden microphone while Mr. Biden looked on.

”May we all make peace with each other,” she said later on Twitter.

Lady Gaga campaigned in November with Mr. Biden in Pennsylvania, a key battleground state that he won. The evening before Election Day, she performed at the Biden campaign’s final rally.