It’s challenging enough making a living as a musician in one orchestra, but the members of the so-called “Freeway Philharmonic” cobble together a living by picking up freelance jobs with multiple groups whenever and wherever they can around the S.F. Bay Area. One of the musicians plays in 8 orchestras. They also teach privately and at universities, and do educational outreach to build the next generation of performers and audience members. And in between paying gigs, most of them go to auditions seeking that coveted spot in a full-time orchestra that will give them a respite from their whirlwind schedule and long commutes. Filmmaker Tal Skloot found their nomadic lives and passion for their vocations fascinating enough to create a documentary that aired yesterday on KQED.