That downtown Los Angeles has become new music central is one thing, but that downtown's new music scene could be so taken over by San Diego-area beach towns, as happened Friday night, really is something that would have been unimaginable a few years ago.

In the Colburn School's Zipper Hall, the Carlsbad Music Festival held a marathon concert to preview the five new music events that this week will fill the city just north of San Diego. At the same time, across the street at REDCAT, CalArts began its Creative Music Festival with a marathon that featured the UC San Diego composer and pianist Anthony Davis and his adventuresome group Episteme.

I checked out the new kids on the Carlsbad block. Founded four years ago by Matt McBane, a young composer and violinist from Carlsbad who studied at USC, the festival became a showcase for a new generation of composers, many under 30.

McBane, now approaching 30, and his festival have prospered. He's relocated to Brooklyn, where he has formed a new music indie band, Build, to play his malleable music, which doesn't distinguish between classical and rock.

Build's catchy first CD, recently released, has caught on with tastemakers at NPR and Amoeba Music and boasts a slate of warm reviews. The Zipper program began with a Build set that closely resembled the CD.

McBane's music has sweet, simple melodies that flow over an ingratiating beat. I look forward to a time when McBane adds more meat to his music, but he is a natural composer, a fresh voice and, from the evidence of his festival, a first-rate organizer with a broad range of musical interests.

Next came an appearance by Red Fish Blue Fish, a percussion ensemble at UC San Diego. The program closed with the Calder Quartet, which has been associated with the festival from the beginning and in an astonishingly short time has become the American string quartet to watch.

And it offered maybe the newest of the evening's works -- a short piece, “Interface," by Tristan Perich, who will be one of the composers featured in Carlsbad.