For the last three days, "Hummingbird" by Seals & Crofts has been on my mind. A song about appreciating a hummingbird, or almost any other animal, wouldn't likely be a pop hit today, but it was in 1973. The repetition of "Hummingbird, don't fly away, fly away," punctuated by a flute, doesn't leave my mind easily once I hear it. The tune's strong vocal harmonies and outside-the-norm lyrics make it one of the most pleasant earworms I've heard.