"Indigenous Instruments," composer Steve Mackey writes of one of his pieces, "is vernacular music from a culture that doesn't actually exist." But at UC Berkeley's Hertz Hall on Friday, the audience was able to catch aural samples of familiar vernacular music. Echoes of rock and jazz jostled with idioms of 20th-century art music in four works by Mackey, performed by Citywater and the Sacramento State Percussion Group. Such is the trademark style of Mackey, a rock-guitarist-turned-composer who has devoted much of his music to melding the many elements of his diverse musical past. The first piece, Micro-Concerto, was an enjoyable primer on this new aesthetic and offered a sampling of the various sources from which Mackey has culled his musical language. The repetition of short melodic and rhythmic fragments characteristic of minimalism rubbed shoulders with the familiar timbres of cool jazz (the second movement is a solo for vibraphone with a pizzicato cello imitating an upright bass). Tying the piece together was a veritable army of percussion instruments. In addition to the Pierrot ensemble of violin, cello, flute, clarinet, and piano, Micro-Concerto calls for vibraphone, marimba, claves, wood blocks, triangles, whistles, bass drums, bongos, maracas, kitchen utensils, and more. Percussionist Ben Prima shouldered the task admirably. Watching him cover the arsenal single-handedly was great fun, as well as a testament to the centrality of physical execution in Mackey's music. One key component of Mackey's style is exploration. Once he comes upon a musical idea, he will linger on it for a while, examining its possibilities. Indigenous Instruments, for example, is built on a number of fixed ideas: Another elaborate percussion set accompanies a violin whose lowest string has been tuned down an octave, creating a low rumble, all underscored by ostinatos that bore the faintest hints of jazz rhythms. The combination of these things made for a clever sonic mobile, though at times the audience found itself simply listening to the music move from one player to another.