Katz commenced his musical career playing piano and bass guitar with various bands in Baltimore. He then decided to concentrate on piano and Hammond organ, and in particular, jazz and blues music. After playing jazz in Boston, he got the opportunity to play bass guitar for Big Mama Thornton. This reconnected him with his love of the blues, which has been his main musical genre since that time. From that band, Katz moved on to play with Barrence Whitfield and the Savages. While in this band, Katz had the opportunity to tour all over Europe and the U.S., playing clubs, festivals and making television appearances.
From Barrence Whitfield and the Savages, Katz moved on to playing organ and piano as well as writing and co-writing material for Ronnie Earl and the Broadcasters. By this time, Katz had been on several different recording sessions with the bands he had played with as well as special guesting on sessions for other artists.
In 2011, Katz was a regular member of Gregg Allman and Friends,Delbert McClinton's Band, the John Hammond Quartet and continues to tour with his own group, The Bruce Katz Band. He also toured in 2009 and 2011 with the Allman Brothers, playing piano. He is a 2008, 2009 and 2010 Blues Music Award nominee for "Pinetop Perkins Piano Player of the Year". In 2009 he also released an album that he co-lead with saxophonist Joel Frahm, called Project A. It was an instrumental tribute to Aretha Franklin, featuring a nine piece band, including Franklin's original bassist and current Gregg Allman Band bassist Jerry Jemmott. In 2011, Katz co-founded a band called the CKS Band (Ciarlante, Katz and Sharrard) with Scott Sharrard and Randy Ciarlante.