Jaffe has toured Japan, performing Glenn Miller's music for concert audiences. She has performed in Manhattan's "Danny's Skylight Room" and twice at Washington DC's "Blue's Alley", where she performed with Keter Betts, former bassist with Ella Fitzgerald, who said of Jaffe: "Stop looking to the heavens for new stars. There's a bright start here on earth that shines with her voice." Janiece has also appeared with the big bands of David Baker, Dominic Spera, Al Cobine, Clem DeRosa, and the Midcoast Jazz Project, now known as the Busselli Wallarab Jazz Orchestra.
Jaffe has been a featured performer at the Newburgh Jazz Festival; at the Jazz On The Rocks Festival in Sedona, Arizona; Indianapolis Jazz Fest and was a headliner for Crystal Cruiselines' Jazz Cruise. She has sung extensively in the Midwest and has also traveled to teach, record, and sing in Hawaii, Florida, California, Las Vegas, and South America.