Coleridge change the traditional concept of the nightingale that it is symbol of sadness to be symbol of joyfull&happinies
وتتكلمين عن تأثير وجود اخته وصديقه معه
and make the nightingale singing it night is not sad but it is beautiful thing
اما Keats
He does not change the traditional concept of nightingale as symbol of sadness and he is suffer from his brother death and from his own illnes
and the nightingale singing at night effict in him and he remember his sadness