Minimum size/maximum quality MP3 sound file balance

My first objective when creating MP3 files is to compress the sound file as much as possible, and I don't want any file to exceed 1MB, if possible. (One exception was compressing a 30 minute poetry recitation into a 1.8 MB file.) That turned out okay, but music is another story. So, I'd like to know more about how to strike a satisfactory balance between size and quality. For the iTunes MP3 import settings,this means choosing between (1) STEREO BIT RATES (16kbps to 320 kbps), (2) QUALITY (Low to Highest), and (3) CHANNEL (mono or stereo)
In the past, I have always chosen mono, but it now occurs to me that the quality enhancement of stereo might justify the larger files caused by slightly higher kbps settings. That's just one example. Anyway, I'd like to read an article on the trade-offs between the variables that iTunes provides. Any
suggestions?

Stereo Bit Rate is what people are talking about when they say that a song is XXX kbps. (kbps is a measure of bit-rate, a measure of kilobytes per second).
Stereo v. Mono really depends on what type of song you are sampling, and what you are listening to it on. For virtually all music recorded after 1970, though, you'd probably want to use Stereo.
Also, you might get some mileage by making sure that you are importing the music at 41.100 kHz rather than using Auto or 48.000. (This is basically the "speed" at which the music is sampled. The faster its sampled, the more information it contains. It makes it higher quality, but also higher file size. You probably won't notice too much difference between 41.1 and 48.)
Finally, you should also check the Variable Bit Rate box. This will help reduce the file size, as the bit rate will be reduced during silences and other times where the song doesn't need more information.
As for the overall Bit Rate, its really subjective. Your best bet is to just try it at a few different levels and decide which is best for you.

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