Magdalena Bay is an American synth-pop and electronic duo from Miami, Florida, based in Los Angeles, California. The duo consists of singer-songwriter Mica Tenenbaum and producer Matthew Lewin. The duo has released one studio album, three EPs, and three mixtapes called Mini Mixes, which are composed of one- to two-minute songs with accompanying homemade green screen music videos.

The duo released their debut studio album, Mercurial World, on October 8, 2021. They have been noted for their informational TikTok videos on the music industry and their kitschy DIY visuals.^[5][6][7]

Tenenbaum was born in Buenos Aires, Argentina, and immigrated with her family to the United States when she was one year old, growing up in Miami. Lewin was born in Miami and is of Argentine descent on his father's side.^[8] Both Tenenbaum and Lewin are Jewish.^[9] They originally met in high school at a program run by Live! Modern School of Music, where they were placed in a classic rock cover band and later began writing their own progressive rock music as Tabula Rasa.^[10][11][6] After that band broke up, they formed Magdalena Bay in 2016 while on vacation from college—Tenenbaum at the University of Pennsylvania in Philadelphia and Lewin at Northeastern University in Boston—and continued to collaborate remotely.^[12] The band was named after an administrator at Lewin's former job.^[7][10]

They have cited Grimes, Chairlift, and Charli XCX as influences.^[7] The duo released their first two EPs, Day/Pop and Night/Pop, in 2019, and signed with indie record label Luminelle Recordings later that year.^[13] They later released two mixtapes and one EP: Mini Mix, Vol. 1 was released in July 2019, A Little Rhythm and a Wicked Feeling was released in March 2020,^[14] and Mini Mix, Vol. 2 was released in November 2020.

The duo released their debut studio album, Mercurial World, on October 8, 2021. The album's release was preceded by four singles: "Chaeri", "Secrets (Your Fire)", "You Lose!", and "Hysterical Us".^[15][16][17] Music videos accompanying the album's singles were also released in promotion of the album.^[18] A deluxe version of Mercurial World, containing fan-submitted "secrets", remixes, and two new songs, was released on September 23, 2022.^[19]

On October 29, 2022, Magdalena Bay performed at the 3rd Second Sky Music Festival.^[20]

In April 2023, Magdalena Bay performed at the 22nd Coachella Valley Music and Arts Festival, and released the mixtape Mini Mix, Vol. 3.^[21][22]