The title does a lot of work before the first line arrives. "Occupation" is what you write on a form beside your name, your job and the way you fill your days. It is also what an army does to a country, and what a preoccupation does to a mind. Dave Bonta's poem keeps both meanings alive. The speaker's occupation turns out to be sitting, but something has quietly taken him over as well.
The first couplet is a small joke. "Busy" is a word for doing and "sitting" is a word for not doing, and the poem sets them side by side without comment. The poem never says what the sitting involves. It could be reading, writing, brooding or simply staring, and that vagueness lets any kind of absorbed stillness fit. "All morning" supplies the only detail, a long stretch of time in which nothing visibly happens.
Then comes the turn: "I am summoned / by a song." The grammar is passive, so the speaker does nothing and is acted upon. "Summoned" is also a surprisingly weighty verb. We are summoned by courts, kings and bells, and a song usually just drifts past. The poem doesn't identify this one. The indefinite "a song" and the morning setting make a bird plausible, but that is an inference, and the poem leaves the source unnamed. The sound of the words reinforces the pull. The soft s of "busy sitting," "summoned" and "song" runs through the poem like a thread, so that the sitting seems already to lean toward the song before the song arrives.
The last couplet is the cleverest. "My eyes too out of tune / to look up" mixes its senses on purpose. Tuning belongs to ears and instruments, not eyes, so the speaker's sight is described as an instrument left at the wrong pitch. The mismatch is the point. The song reaches him, but the part of him that ought to answer it is set to a different channel, tuned by hours of looking down or inward. The word "too" adds a hint of self-mockery. He is not slightly off but *too* out of tune, which makes the confession both rueful and a little comic. The musical vocabulary of "song" and "tune" carries on through the poem's closing lines. The summons has been heard but cannot be obeyed.
The form is as spare as the sentence. There is no rhyme and no punctuation, only three couplets with lowercase openings, which keep the tone quiet and unassuming. The line lengths follow a pattern: four syllables then three in the first two couplets, then six then three in the last. Each couplet ends on a short, slight phrase ("all morning," "by a song," "to look up"), but the third stretches its first line longest before dropping to the shortest finish, as though the effort of lifting the head were being measured out. The poem ends on the word "up," pointing skyward and then stopping. The look never happens on the page. With no full stop, the sitting seems free to go on, and the reader is left to supply the missing gesture.
What makes the poem worth reading is how much it holds in nineteen words. It is not preachy about distraction or about noticing the world, and it does not say whether the missed song is a loss. The tone might be regret, or amused acceptance, or both at once. Anyone who has been so absorbed in a task that they registered a sound without being able to respond will recognise the situation. The double meaning of the title explains why it stings. Our occupations are the things we choose to do, but they can also occupy us, filling the space where attention might have gone to something freer. The poem doesn't resolve that tension. It leaves its speaker with his head down and a song still sounding somewhere above him.