(CNN) Justice Ruth Bader Ginsburg made what is believed to be her first public appearance since her December cancer surgery when she attended a performance of "Notorious RBG in Song" on Monday, the Supreme Court spokesperson told CNN.

The Washington outing was to support her daughter-in-law, soprano Patrice Michaels, who released an album of songs chronicling Ginsburg's life. Ginsburg's son, James, produced the album.

The concert was performed by Michaels and other musicians, and was held at the National Museum of Women in the Arts.

Jeff Rosen, CEO of the National Constitution Center, tweeted the news of Ginsburg's attendance.

"Thrilled that Justice Ginsburg attended the first concert performance of #NotoriousRBG in Song. She, Patrice Michaels, and the performance were magnificent!" Rosen tweeted.

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