Guitar Trek's pioneering develop of a unique family of guitars of different sizes - treble, standard, baritone and bass guitars, has opened up an undreamt world of sound and creative possibilities for the guitar. The group's commitment to these instruments and their use in varying combinations, in an array of stunning new repertoire developed over 14 years, represents a major new direction for the guitar quartet in contemporary chamber music. While the newly developed instruments remain closely related to the standard guitar in design, the resulting four-voiced ensemble has a range of over five octaves, creating a stunning larger than life aural spectrum of all the guitar's most appealing timbral qualities.

The instruments have all been constructed with the use of Australian maker Greg Smallman's groundbreaking lattice design, viewed by many as the most important development in guitar construction since Antonio Torres in the 1850's. The instruments have a striking visual impact, a richness of colour and depth of sound that have captivated audiences world-wide.

Guitar Trek plays standard guitars by Greg Smallman, treble guitars by Eugene Philp and Greg Smallman, and baritone and bass guitars by Graham Caldersmith.