Bees on that 蜜蜂の巣, or some other, busy in the last bright 光 before the 夜. They are singing the helicopter song (i.e. the 蜂 song that makes them all sound like helicopters... it is a bit specific, you've never heard it on the ラジオ     気が付いてみると 私は蜂を眺めていた