She grew up in New Haven, CT, where she studied the cello as a child and started playing the guitar when she was a teenager. Bloom collaborated with Bruce Neumann in the early '70s, but it wasn't until she met avant-garde guitarist Loren MazzaCane Connors in 1976 that she started recording. Bloom and Connors recorded five albums of fragile, simple folk and blues melodies, the majority of which were written by Bloom herself. Their collaboration ended in 1984 with the release of their final album, Moonlight, of which only 300 copies were pressed.

Bloom stopped recording new material soon after her collaboration with Connors ended, and a period of financial hardship followed. A single mother, Bloom focused on raising her children, rarely playing shows outside of New Haven. Director Richard Linklater discovered Bloom's music sometime in the early '90s and subsequently featured her song "Come Here" in his 1995 film, Before Sunrise. Encouraged by Linklater's interest in her music, Bloom started writing new songs and released her first album in over ten years, Come Here: The Florida Years, in 1999. The album was followed up with a re-release of songs she had recorded with Connors just before they split up, 1981-1984. This was followed by Sing the Children Over in 2001, Kath Bloom and Loren MazzaCane Connors in 2002, and the retrospective collection Finally on Chapter Music in 2005. In 2008, Ms. Bloom issued Terror, that was recorded solo and with backing from her Love at Work Band. Chapter followed this in 2009 with a tribute album called Loving Takes This Course: A Tribute to the Songs of Kath Bloom. It featured covers of Bloom's songs from contributors that included Marble Sounds, Bill Callahan, Laura Jean, Mark Kozelek, Mick Turner & Peggy Frew, Devendra Banhart, Scout Niblett, the Dodos, Josephine Foster, Mia Doi Todd, Corinna Repp, Marianne Dissard & Joey Burns, Amy Rude, Meg Baird & the Concretes. Bloom signed with Kozelek's Caldo Verde label for 2010's Thin Thin Line.

In typical fashion, Bloom played occasional shows, but otherwise remainerd silent for another two years. In 2012, Here I Am, a five track digital EP was issued by Caldo Verde. Thoug hshe appeared on Pink Castle by Jennifer Castle and This Frontier Needs Heroes' The Future, Bloom focused on writing for the next two years. In 2014 she went to record in Calfornia for the first time. She emerged with the album Pass Through Here, which was issued by Chapter Music in early 2015. ~ Margaret Reges and Thom Jurek