Trey Gunn and Pat Mastelotto are probably best known for their time with the British band King Crimson being the rhythm section of the band and playing on many of the bands latter day releases such as Thrak and were also part of the offshoot Projekcts releases and performances with other members of King Crismson. Before King Crimson Pat Mastelotto had been a member of the band Mr. Mister. Gunn had previously played in a number of projects with Robert Fripp.
Tu is the name of the band the duo formed and also the title of the band's debut album which was originally released in 2003. To date this album has been the only release from the band although both Mastelotto and Gunn have worked with other Musicians under the name KTU.