Tot Seymour, born Grace Mann on October 23, 1889, in New York City, was a prominent American lyricist renowned for her contributions to popular music in the early 20th century. She passed away on August 31, 1966, in her birthplace. Seymour's career was marked by her role as a staff lyricist at Irving Berlin’s publishing company, Waterson, Berlin and Snyder, and as a contract writer for Paramount. She was known for writing special material for notable performers like Fannie Brice, Mae West, and Sophie Tucker, as well as for the Ziegfeld Follies.

Seymour collaborated with composers such as Sigmund Romberg and J. Fred Coots, with whom she co-wrote "I Miss a Little Miss." Some of her popular songs include "Swingin' on a Hammock" and "I'm Makin' Hay in the Moonlight." Her partnership with pianist and composer Vee Lawnhurst was particularly significant; they were celebrated as the first successful female songwriting team in popular music history. Their work was influential in the burgeoning medium of radio during the 1930s.

Beyond songwriting, Seymour's career extended to writing radio and drama scripts, and she made a film appearance with Lawnhurst for Paramount Pictorial in 1935. Her legacy is preserved in the Tot Seymour papers, a collection housed at the American Heritage Center, University of Wyoming, which includes her song lyrics, radio scripts, and other career-related documents.