Question

what feeling left the poet when he heard the singing
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Answer 1

Answer:

he feels relax and feels very happy

Answer 2

Answer:

The speaker is overwhelmed by the beauty of the woman's voice and her "melancholy" song as he passes by the field where she works. He compares her lovely voice to birds, suggesting that her singing is actually more beautiful than theirs:

No Nightingale did ever chaunt

More welcome notes to weary bands

Of travellers in some shady haunt,

Among Arabian sands:

A voice so thrilling ne'er was heard

In spring-time from the Cuckoo-bird,

Breaking the silence of the seas

Among the farthest Hebrides.

He claims that no nightingale's song was ever more welcome to weary travelers in faraway and foreign places...