She has performed and recorded with a diverse range of artists such as Sufjan Stevens ("All Delighted People" EP), Sarah Blasko, Noe Venable, Clare & The Reasons, John Wesley Harding, Missy Higgins, Matt Kanelos, Martha Wainwright, Glenn Tilbrook (Squeeze), Glenn Patscha (Ollabelle), Joan As Policewoman, The Last Town Chorus and Madeleine Peyroux, Elysian Fields and was cited as one of NYC's Top 20 Orchestral Pop artists (the Deli Magazine).

In 2009 a successful Kickstarter campaign[3] raised funds for The Universal Thump,[4] a band co-led by Adam Gold and album loosely inspired by Moby Dick, performed by an orchestral pop collective and initially released in 4 chapters.

Greta was a composer in Ars Nova's "Uncharted" Program and Polyphone Festival (Philadelphia), where she developed the musical "The Real Whisper" with playwright Akin Salawu.

She and Stew (Tony Award winning creator of "Passing Strange") were granted a residence at The Orchard to begin development of their musical "Anna Hit".

In early 2023, Greta made her Lincoln Center debut with her show ‘Characters’ merging an orchestral pop ensemble with guests from the musical theater world.

Greta is also composed music for Dr. Seuss Tonies characters Cat in the Hat, The Lorax, The Grinch and others, in collaboration with LA-based actor-producer, Bill Kates and Adam Gold.