Red-winged Blackbirds have a strong and clear voice. Their songs and calls easily carry over water and across fields. The classic Red-winged Blackbird song sounds like they're singing "conk-la-ree, conk-la-ree."
Tune into KRCB.org (104.9 FM Sonoma County) to listen for the current segment. Ear to the Wild is a short interstitial segment aired somewhat randomly throughout the day between other programs. They use shorts and postcards to fill airtime during breaks from Morning Edition and All Things Considered. Also during their music programing, as needed. Greta Mart tends to air them during her show around 4:47 or 5:47.
Check out these links for more information about Redwinged-blackbirds:
Sonoma County Birdwatching Spots: Red-winged Blackbird, Agelaius phoeniceus
California NatureMapping Program: Red-winged Blackbird
All About Birds: Red-winged Blackbird