She began her music career as a member of Iluminada,[1] is the founder of the electronic rock band Zigmat, and collaborated in Pacha Massive before forming her own solo project in 2012.

Lionheart's early education began with piano lessons starting at the age of 5, while a large portion of her childhood was spent traveling from Spain to Puerto Rico.

Her father's eventual work transfer led Lionheart to San Antonio, Texas where she would spend her teenage years learning the flute and acoustic guitar.

Fusing elements of rock, electronic dance music, and trip-hop into a style of their own, the group united a diverse set of musicians whose distinct backgrounds collectively defined the band's sound.

Monica uses poetic lyrics in the tracks "Watch The World", "Between Bullets", and "Fire," each one displaying Lionheart's upper registers with a hushed seraphic quality.

Billboard 's review about the album, “the band’s debut release blends cultures and enigmatic styles…[and it] kneads in a dash of rock and pop flair and has already inspired comparisons to such established trip-hop acts as Massive Attack, Air and Goldfrapp.” The Improper Magazine says, “the electronic sounds they make forged with [Lionheart’s] out-of-this-world vocals and tantalizing effects make Zigmat one extremely arresting and sensual musical concoction.” Zigmat's music has been featured in the film Backseat (by Bruce Van Dusen) and has garnered local television appearances in New York City (Hit Records Nightlife Videos) and Philadelphia (NBC's The 10!

In 2009, Zigmat signed with Spanish label Actua Musica and began touring for much of that year, performing at Europe's Sonar Festival held in Barcelona, Spain whose appearances also included Radiohead, Air and Sigur Ros.

It's a wonderful fusion that makes for great energy in their recordings and on stage.” — DJ Raul Campos, KCRW In 2010, Lionheart dismantled Zigmat and began working with singer, multi-instrumentalist and producer, Ramon Nova of Pacha Massive.

Pacha Massive has shared the stage with artists like Morcheeba, Taio Cruz, Ozomatli, Café Tacvba, Los Amigos Invisibles, Aterciopelados, Sidestepper, among many others.

Produced by Steve Wall (Pearl and the Beard) with Dan Molad (of Lucius) and Ryan Alfred (of Calexico), Missed Connections was released January 29, 2016.

Time Out Magazine says, "Singer-songwriter-multi-instrumentalist Monica Lionheart layers her frosty voice over wafty electropop in a manner that suggests dry ice—and lots of it—plus St. Vincent, and early Cure records interpreted by a tropicalia singer.

"Recommended for fans of Goldfrapp, St. Vincent or Portishead, this Brooklyn-based Berklee alum brings a freshness to the electro-pop genre with her distinctive vocals that are both haunting and enchanting," says Paste Magazine.

This fusion of Monica's warm, retro-pop sound with flowing analog synths and dynamic Latin vibes showcased her ability to captivate diverse audiences beyond the traditional music realm.

This collaboration not only highlighted Monica's impact in the marketing sphere but also showcased her ability to transcend musical boundaries, making her a sought-after artist in various creative realms.

Bringing a freshness and expansive quality to the blossoming electro-pop genre, Monica's new album shines with her distinctive vocals that are absolutely and effortlessly enchanting says Broken 8 Records.