She is known for her independent releases, inspired by Frank O'Hara's poetry, DIY ethics of K Records and the early 2000s New York City's anti-folk scene.

[1] Home-schooled for most of high school, she spent time by attending underground rock shows in New York and getting involved in the Westchester music scene.

[1][2] In late 2011, she started to perform under the alias Frankie Cosmos, a name coined by her now ex-boyfriend Aaron Maine of the band Porches.

[12] On April 12, 2017, Frankie Cosmos announced a slew of tour dates and that they recently had signed to Sub Pop records.

On June 9, 2017, Kline opened for IAN SWEET and Girlpool at Warsaw in Brooklyn as part of her new project Lexie.

Joined by Warehouse members Alex Bailey and Doug Bleichner, their first release is on Bandcamp and it is called "Record Time!".

[16] On February 22, 2024, she released the single "Guess What to Do" / "Calling It a Night" in collaboration with Cody Fitzgerald of Stolen Jars as haha same.