A speech is not an essay - these text types have several crucial differences.
If one of the papers asks for a speech:
Firstly, pay close attention to the question, especially regarding the PURPOSE of the speech and your AUDIENCE. What you write for an "audience of your peers" will be different to the opening night of an exhibition on History and Memory for example. (I'm not making any predictions, just using an example so calm down people and don't freak out)
If it is an audience of Year 12s or other students, DO NOT BEGIN WITH GOOD MORNING. This is so boring, everyone does it, and good public speakers who are aware of their audience would not usually begin this way. I would start with a quote (not necessarily from the text - could be one about the composer, the themes etc), an anecdote, a rhetorical question, something interesting and engaging that will set your writing apart.
If it's a formal speech, by all means start with a conventional greeting but do be aware of what the question is asking. If it's for an opening night, don't say good morning etc.
About the speech as a text type - try writing in shorter paragraphs than you'd normally use for an essay. Think about using more concise language, and varying the length of your sentences. Try to avoid excessively long sentences because these are more commonly seen in prose or essay form than in speeches. This shows you are not just "topping and tailing" a preprepared essay but are actually responding to what the question asks. Also shows you have some knowledge of the forms and features of a speech.
Try using some vivid and engaging descriptive language which will emotionally appeal to your audience (if this is relevant to the module/question). A speech is a performance and needs to capture and maintain audience attention.
Rhetorical questions are good, as is a more conversational tone. Try using more collective pronouns ("As we can see in...", "Here, Shakespeare shows us...", "Our understanding is shaped and reshaped by...")
Also, don't neglect the conclusion! Keep it shorter than you normally would and make sure you leave the audience with something to think about. Could be a quote, a question, a challenge to think differently or take action in some way....use the last sentence to leave a good impression on the audience/marker and neatly tie up everything you've discussed.
Hope this helps and good luck to everyone