Oh, Susanna,

Oh don't you cry for me
For I come from Alabama
With my banjo on my knee
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What is the meaning of the sentences?
1. Don't cry for me, because I've come from Alabama with my banjo on my knee.

2. Are you crying now? Don't do that, because I've come from Alabama with my banjo on my knee.

3. Do you want to cry for me? You don't need to do so, because I've come from Alabama with my banjo on my knee.

4. What else.........

The meaning of the sentences is that the speaker is reassuring "Susanna" not to cry for them because they have come from Alabama with their banjo on their knee. It implies that they have a banjo, which is a musical instrument, and they may be singing or playing it for Susanna to bring joy or entertainment. The sentences express a sense of pride in their Alabama origin and their readiness to provide music or entertainment with their banjo.