Mr. Castel, who guided generations of the world’s foremost singers through the oohs and aahs of their craft, appeared in nearly 800 performances with the Metropolitan Opera.
Ms. Ritchie brought hundreds of traditional songs from her native Appalachia to a wide audience and performed with major names in folk music, including Pete Seeger and Doc Watson.
The logo was a routine assignment for Mr. Dior, completed in one afternoon, while he was working for Sandgren & Murtha, a New York City marketing concern.
Mr. Wright, who published about a dozen volumes of his work, wrote of beatings and suicide, and of his difficult relationship with his father, the poet James Wright.
Ms. Rosenthal’s work melded dance, theater, dramatic monologues, improvisation and visual art to illuminate her abiding concerns: feminism, environmentalism and animal rights.