Currently based in Nashville, Tennessee,[2] she started her music career as a professional clogger with Footworks Percussive Dance Ensemble and in the early 2000s joined the folk bands Uncle Earl and Sometymes Why as a vocalist, dancer, songwriter, guitarist.

[5] She has recently toured as a harmony singer, fiddler and harmonica player with Aoife O'Donovan, Dawn Landes, Jeffrey Lewis & the Junkyard, Lucius and Jefferson Hamer.

In 2011, Andreassen and Laura Cortese co-founded Miles of Music Camp, an all-ages artist retreat that operates weekend and week-long workshops in New Hampshire, Brooklyn and Boston.

[10] When she joined, the lineup featured KC Groves, Abigail Washburn and Rayna Gellert,[2] and the group then recorded two EPs followed by two full-length albums with producers Dirk Powell and John Paul Jones of Led Zeppelin.

[11] Andreassen became a founding member of the "folk noir" singing trio Sometymes Why in 2005, when she got together with two women from other notable stringbands (Aoife O'Donovan of Crooked Still and Ruth Ungar Merenda of The Mammals) to write and record a singer-songwriter album.

Their self-titled album was recorded live in May 2005 under the name Sometymes Why, and the band went on to tour the United States and Ireland, including appearances at Bonnaroo on NPR's Mountain Stage.

Schatz played bass and banjo, with guest artists such as Aoife O'Donovan, Ruth Ungar, Scott Senior, Eric Merrill, Rushad Eggleston and Oliver Steck.

In 2007, Andreassen and filmmaker Tom Krueger created a music video for Uncle Earl featuring a Kung Fu-style clogging battle set in a Chinese restaurant.

She co-founded a Monday night old time music session at the Lowlands Bar in 2010,[2] hosted a series of variety shows at the now-defunct Banjo Jim's in the East Village,[17] and taught dance and performed regularly at the Jalopy Theatre in Brooklyn.

[19] A number of the album's tracks were made available for download along with pre-orders, and the first single, "Azalea," debuted on December 4 on CMT Edge, with the publication calling it a "delicate beauty" with a "sleepy, contented feel... backed by a gentle accompaniment of woodwinds.

Recorded in Brooklyn, New York,[21] it features a multitude of guest artists, including vocalists Aoife O'Donovan, Ruth Ungar Merenda, and Cassandra Jenkins.

[22] For March 2015, Andreassen has announced a full band tour of New England, including Joe's Pub in New York City, and Club Passim in Cambridge, Massachusetts.