Here lies the irony. The frog is a great schemer. He is jealous of the song of nightingale. So he finds faults with her song instructs her to practise hard. He suggests her that she should follow him in singing continuosly loud. But when the nightingale follows him becomes hoarse in her voice. He very cunningly remarks that your song must be your own.    Hope this helps.
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Your song must be your own is quite ironical b because the same who let her die is changing his opinion that her song must have been her own.
HOPE IT HELPS U !!!!!!!!
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