an mp3? grammar rule?
For example when one says "what is an mp3?" he uses "an" atricle.
I read "a" atricle is put if the next word starts with a consonant sound and "an" article is put if the next word starts with a vowel sound.
Here Mp3 starts with a consonant sound M.
I wonder what is the rule which works here?
In which else situations should I put "an" article before a word starting with a consonant sound?

Question

an mp3? grammar rule?
For example when one says "what is an mp3?" he uses "an" atricle.
I read "a" atricle is put if the next word starts with a consonant sound and "an" article is put if the next word starts with a vowel sound.
Here Mp3 starts with a consonant sound M.
I wonder what is the rule which works here?
In which else situations should I put "an" article before a word starting with a consonant sound?

Answer

The reason why you write "an MP3" is not because of the letter "M" but you are actually saying "em" to say that letter.

"an em-pee three"
so you see there is a vowel sounding there as opposed to..
"a mother"

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