How to get to Los Angeles from Santa Clarita using commute?

-I don't have a car and neither do my friends but we want to go to LA to hang out, and I was wondering if anyone knows how to get there from Santa Clarita by commute? (i.e. buses, trains, etc...) Taxis is a no no for us since we're kinda limited in money and cab fare seems so expensive considering how far LA is from SCV. The part in LA that we want to go is downtown, preferably Korea Town. Also there is this concert that we want to go to in Hollywood Bowl and anyone knows how to commute there too?Yes. Use Google Maps and use the Public Transit Filter.