Lovely spring weather and the opportunity to hear members of the visiting St. Louis Symphony performing original works of chamber music by UC Davis faculty composers outdoors brought out an audience of about 300 people for Friday’s “Egghead Walk” at UCD. Here, a violinist joins her colleagues under the baton of conductor David Robertson in performing Mika Pelo’s “Night Music,” which was written to be performed alongside the Egghead “Eye on Mrak (Fatal Laff),” created by the late UCD art professor Robert Arneson. Also featured on the walk were new musical works by Pablo Ortiz, Ross Bauer, Laurie San Martin, Sam Nichols and Kurt Rohde. The symphony will perform at 7 p.m. Sunday at the Mondavi Center, featuring works by Beethoven, Brahms and Alban Berg. A few tickets are still available for the evening program ($55-$99 general, $27.50-$49.50 students).