[7][8] Niemietz is a regular cast-member with Postmodern Jukebox,[9][10][11] appearing on a dozen albums,[12] a PBS television special,[13] and an MTV music video.

[14] She is a featured artist on Richard Marx's A Night Out with Friends (2012) (PBS), Christmas Spirit (2012),[15][16] and B. J. Thomas's The Living Room Sessions (2013).

On video, BJ Thomas appears delighted that the youngster is completely at ease with singing "Hooked on a Feeling" in front of an audience.

[24] With high school behind her, Niemietz teamed with Emmy Award winner, W. G. Snuffy Walden, and Taylor Made Studios for her latest EP offerings, Push Play and Christmas Favorites.

Niemietz's cover of Adele's "Rolling in the Deep" brought 7 million views after her YouTube presentations caught the attention of Ellen DeGeneres.

Niemietz appeared as a featured artist on the Ellen DeGeneres Show in May 2011,[27][28] and, in January 2012, she charted #14 on Billboard magazine's, Next Big Sound.

[29] On June 10, 2012, Niemietz was again invited to share the stage with 5-time Grammy Award-winning, B. J. Thomas, some fifteen years after their initial impromptu performance.

[33] On June 28, 2013, shortly after her twenty-first birthday, Niemietz took the stage with B. J. Thomas to perform "Hooked on a Feeling" at the Grand Ole Opry.

Rearranged by Bradlee, Talking Heads', "This Must Be the Place (Naive Melody)" (1983) is transformed into a swing piece featuring the horns of Lemar Guillary and Danny Janklow.

[40] Postmodern Jukebox released a second collaborative video featuring Niemietz, singing Scott Bradlee's rendition of "Hey Ya!"

[42] In November 2015, Niemietz joined the U.S. Northeastern leg of the Postmodern Jukebox tour,[43] culminating the season at the Microsoft Theater in Los Angeles on December 11, 2015.

[19] The Los Angeles production of 13, with an all teenage cast and band, received a nomination for the 2007 LA Stage Alliance Ovation Awards, World Premiere Musical[21][59] Niemietz was chosen to play the role of Wanda in Enter Laughing, The Musical, a one night only performance (January 28, 2013), honoring Carl Reiner's seventy-fifth year in the entertainment industry.

[60][61] In 2015, Niemietz was again cast as Wanda in Carl Reiner's musical, Enter Laughing, this time at the Wallis Annenberg Theater in Beverly Hills, CA.

Snuffy Walden, with various studio musicians appearing on her albums such as: George Doering, Randy Kerber, Bennett Salvay, Andrew Shulman and Herman Matthews.

[79] On March 11, 2016, Niemietz covered a big band version of Elle King's "Ex's & Oh's" with tap dancer Sarah Reich on MTV UK.