She had her biggest fame in the early to mid 1960s, with hits like this:
She was around 16 years old at the time and already had a smash with that song. "It's My Party" came out in 1963.
Brooklyn-born and New Jersey-raised, Gore was discovered by Quincy Jones as a teenager and signed to Mercury Records. She graduated from Sarah Lawrence College with a degree in English/American literature.
Gore's other hits include "She's A Fool," ''Sunshine, Lollipops and Rainbows," ''That's the Way Boys Are" and "Maybe I Know." She co-wrote with her brother, Michael, the Academy Award-nominated "Out Here On My Own" from the film "Fame."
She also played Catwoman's sidekick in the cult TV comedy "Batman."
Gore also made headlines a number of years ago when she came out as a lesbian. Her partner of 33 years, Lois Sasson, survives her, along with Gore's mother and brother.