The group's core members were Jamie and Joe Silvia, a married couple who played with a number of session musicians and other singers.

The audio engineer was impressed enough with their performance that he shared the music with Ernie Altschuler in Columbia's artists and repertoire division, leading to a recording contract.

Their most prominent collaborator was Don Shelton, a tenor who was part of The Hi-Lo's, but others included Marshall Gill and Len Dresslar, whose deep bass voice is best known for the Jolly Green Giant's "Ho!

Examples of well-known brands for which they recorded jingles include Campbell's, Marlboro, Schlitz, Sears, Pillsbury, Alka-Seltzer, Wrigley, Amana, Mr. Clean, Green Giant, and Kellogg's.

[6][7][4] A July 1964 Time article reported that they were earning $250,000 per year for their work, and that even Broadway producers interested to hire Jamie learned that she was out of their price range.

earned a nomination for Best Performance by a Vocal Group, losing to Peter, Paul and Mary (for "Blowin' in the Wind"), and they were in the running for Best New Artist, which was won by The Swingle Singers.

A Time article about them titled "Oratorios for industry" called them "the best commercial-single ensemble [in which] all four singers deliver their words with the sort of enunciation that makes poets out of admen.

A Variety review of that album noted that The J's with Jamie sound young and "sprightly," but show a wide range of genres and "professional efficiency.

"[16] Music journalist Marc Myers described Jamie's voice as "lovely and special [with] an upbeat warmth and polished perfection to her intonation that came with a girl-next-door naturalism reminiscent of Eydie Gorme.

"[8] A WFMU blog noted that although the Columbia records are long out of print, bootlegs in Japan have had a "substantial" influence on J-pop.