The audience was the usual new-music-at-LACMA size: far too small. The lineup for this season teems with promise. It includes a retrospective of California-based creativity including remembrances of the early years before ”Evenings on the Roof“ became the ”Monday Evening Concerts,“ and of that hotbed up north, the San Francisco Tape Music Center. Scodanibbio will be back; so will the astonishing pianist Marino Formenti, for three concerts. I‘ve probably told you all this before, but you need reminding: these LACMA concerts are as beckoning as any musical events in this part of the planet, and God knows the price is right: a paltry $15, even less for us dodderers. Even the time is right; too many people showed up late for the 7:30 start time, so they’re back to 8. Be there.