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It has struck me that people don't spend enough time thinking about the openings of their compositions. Usually, they start off with everything going hammer and tongs. They start with their first idea first and then carry on from there. We're going to try a different approach.
In the past, it was quite usual to open with an introduction. Especially for larger compositions, such as symphonies or operas, it was necessary to quieten the audience; this is why many classical pieces start with slow, loud, stately introductions. By the time they were over it was hoped that the audience would have got the message. In one sense you're trying to do the same thing - get people's attention.
Over time, explicit introductions became less popular. Instead, entire introductory sections or movements would be used - this is common nowadays.
These are not so much rules as suggestions. There are many ways to complete the project, these are just a couple of the more obvious ones.
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In general, composers didn't really get the point of the 'introductory' part. This is probably my fault, in not giving sufficient examples.
It's all to do with atmosphere and drama.
Good luck!