As we discussed earlier in class, "Because I Could Not Stop For Death" was about death. However, the tone and the mood of the poem wasn't the natural tone and mood one would expect in a 'death' poem. The overall rhythm of the poem was incandescent and the author accepted death as reality than mourning and grieving about death.
"I Felt a Funeral In My Brain" and "I Heard a Fly Buzz When I Died". are two poems which-I think-differ with "Because I Could Not Stop For Death" The imageries in those two poems are used to portray sadness and reminiscence. The overall tone and mood of the two poems are melancholy and gloomy. It's quite surprising how Dickinson was able to write two different version of poem about death.
There is a definite connection between "I Felt a Funeral In My Brain" and "I Heard a Fly Buzz When I Died". The speakers remember small details and recognize those details. This fact implies that speakers in the two poems desire to live than face the upcoming death of their lives.