Based in Portland, Oregon, the group have released seven studio albums, on labels including Southern and Temporary Residence, and have toured across North America and Europe.

Portland musicians Timothy Horner (violin) and Bill Slater (piano/bass) later joined the group to record their first EP.

Paul Spitz left the US to travel in Turkey and Zak Riles joined as guitarist, often playing more of an acoustic role.

[3] The band carried on with only four players recording and releasing the Black Tar Prophecies series which is described as "... revealing their fondness for the '60s and '70s experimental artists that saw music as a process of discovery.

"[4] The group often picks up an extra musician for tours, allowing Amos to switch between guitar and drums and expanding the live instrumentation.

[5] A compilation DVD was released on April 7, 2009, called Acid Rain summing up their most productive period.

[15] Hall & Amos have their own genre-blurring duo, Lilacs & Champagne, who have released music on the Mexican Summer label.