I left my heart's door open, But no one walked in. I laughed but no one laughed with me. All that's left is a symphony. It's coming from the back of my heart. I'm waiting for someone to hear it. Will you listen?
The emotion that is in this poem is strong. I like it. What I see is a jumble of emotions under a cloud of sadness and loneliness. I like the contrast between your actions and the lack of response of others. This produces that extreme sense of loneliness and sets the mood for the rest of the poem. Now, on the fourth line, you put "All that's left is a symphony." I love that line! When I read that part, I can hear a single sound made from many parts. Just like a single emotion is never simple, neither is any one sound from a symphony. The question at the end is good. It engages the reader. Also, I like the sudden change of focus, from "I" to "you". It helps the reader feel the emotion.
It's sometimes tricky to critique something so short, but this is a very well written piece. The conceit of the poem is great. I see a war of emotions covered by a blanket of loneliness which really makes the vision clearer. The literal meaning is great and creative and again that really adds to the poem's conceit. My favorite line is the fifth one. It creates an image of distance and I feel like I'd have to do a great deal to be able to hear that symphony. The poem is also economized very well. It has just the right amount of words that are organized in a good manner.
Good job and thank you for the read. I enjoyed it.