The estate of the late Tony-winning soprano, Barbara Cook, is listing her classic Upper West Side co-op for $2.87 million.

Cook, who died last month at age 89 of respiratory failure, made her name as the original Marian, the librarian, in the 1957 Broadway hit, “The Music Man.”

“No one sings theater songs with more feeling for the music or more understanding of the lyrics than Barbara,” Broadway bigwig Stephen Sondheim once said, in an interview with the Washington Post.

Cook also struggled with alcoholism during her life.

The fourth-floor unit is in 140 Riverside Drive, an Emery Roth-designed landmarked building that dates back to 1939. The building features a “sunken garden loggia” and a large lobby with a glass-enclosed solarium that looks out to the avenue — one of Manhattan’s most tony thoroughfares.

The two-bedroom, two-bathroom unit has a large entertaining space and a formal dining room.

It boasts Riverside Park views and a rounded corner window. In 2016, at age 88, Cook planned a solo show on Broadway but had to cancel due to a deadline to finish her autobiography, according to reports.

But a few months later, she sang from a wheelchair on stage while promoting the release of that title, “Then and Now: A Memoir.”

“You don’t need to look like anybody else. You don’t need to sound like anybody else. Have the courage to give us your true self,” she wrote in her book.

“You are enough. You are always enough. We are always enough.”

The listing brokers are Douglas Elliman’s Richard Steinberg and Matthew Slosar.