River of 1,000 Streams is a wild new piece for piano and up to 11 ''cascading echoes'' that stack up to create dense sonic torrents, as well as more delicate textures. Performed by renowned pianist Vicki Ray, this virtuosic music rumbles from the piano's lowest notes up through its highest in a succession of lovely ever-drifting harmonies. Daniel Lentz has been a fixture on Southern California's new-music scene for more than 45 years, prolifically creating a very personal music that reflects and refracts various experimental and post-experimental trends. Hi smusic is both relentlessly propulsive and lushly beautiful, and it may hint at pop/jazz harmonies or toy with late Romantic gestures, while always offering Lentz's distinct musical vision and reveling in a joy of music-making. Grammy nominated new music champion Vickie Ray, a founding member of the California EAR Unit and Piano Spheres, has perfomred with the Los Angeles philharmonic and many other groups.