As a backing vocalist, she has recorded for numerous artists such as Frank Sinatra, Sammy Davis Jr., Lena Horne, James Brown, Blood, Sweat & Tears, Burt Bacharach, Barry Manilow, Laura Nyro and Steely Dan.

Miller has also worked extensively as a jingle singer, recording for clients such as State Farm Mutual, American Airlines, Budweiser, Coca-Cola, and McDonald's.

After high school she attended NYU in the Bronx (uptown campus) for one year, but felt undirected there and decided not to stay.

Miller's first auditions were at the Brill Building, where she introduced herself to whichever publishing companies were listed in the lobby.

Reparata and the Delrons signed with RCA in 1965, and producer Phil Spector decided that for their first single, "I Can Tell", a third singer was necessary.

Quite a few[quantify] jingles won awards and became famous enough to enter the pop culture mainstream for that time,[which?]

In recent years Miller has participated in many "classic girl group" tribute performances, and is singing in 'Dusty', a trio alongside Sherryl Marshall and Deborah Berg.