Oh! "darkly, deeply, beautifully blue," As some one somewhere sings about the sky.

The speaker breaks into an exclamation about a “darkly, deeply, beautifully blue” sky, but immediately qualifies it as something “some one somewhere sings,” signaling quotation-at-a-distance rather than direct description. The effect is self-aware and slightly ironic: the line gestures toward a familiar lyrical commonplace (the rapturous hymn to blueness) while keeping it at arm’s length, as if the speaker cannot—or will not—fully inhabit that conventional poetic rapture. The doubled remove (“some one somewhere”) suggests hazy cultural memory and the way stock poetic phrases circulate detached from their origins, becoming shorthand for a mood rather than a precise observation.