“Hummingbird” by the 70s soft-rock duo Seals and Crofts reached #20 (US Pop), #3 (Canada Pop) and #12 (Adult Contemporary) in 1973. According to AllMusic.com, the lyrics quote from the scriptures of the Baha’i faith which the duo shared and features a “segmented structure, with a chant-like opening and a sharp change in tempo, which didn’t stop it from becoming a hit…for all of its beauty, the soaring orchestral accompaniment (highlighted by lofty strings and a gorgeous horn part) never eclipses the core sound of the duo’s singing and their acoustic guitar/mandolin combination.”
An intro in 3/4 transitions between E minor and E major, ending with keening chromatic melody over A major. After transitioning to 4/4 for verses and a chorus alternating between D minor and D major, 3:20 brings a sweeping extended outro, with myriad chords floating over a consistent D pedal-point in the bass. At 3:45, a progression of C Maj | F Min | : E major | A Major : | wraps up the tune as it heads for the horizon.