I keep hearing this bird's song out of the field behind my house. I'm in N. San Diego county, in the hills about 6 miles from the ocean, in a rather rural area. I think maybe? it's one of our warblers, but not sure. I've attached a short recording. Hope you all can hear it clearly enough. Thanks for any help, this has been just driving me nuts, not being able to ID this bird by it's call. I'm hearing it mostly starting at miid-morning, throughout the day, but mostly mid-morning, then early evening.