The Quartet Trio is a jazz ensemble led by saxophonist Dr. Todd Williams, featuring a permanent lineup of three musicians. Despite the name, it is a trio that aims to create the expansive sound of a larger group. 

The core members of the group are:

• Robert Rucker

• Dr. Todd Williams

• Yuma Takagi

The ensemble released a project titled Introducing the Quartet Trio and has performed at notable jazz venues such as Smalls Jazz Club in New York City.