The size of an mp3 file will vary depending upon the length of the song and the amount of compression used. A higher level of compression will mean poorer sound quality but a smaller file size. In general an average three minute song at an acceptable sound quality will be around 4 or 5MB.
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It strongly depends on the bitrate quality of the song, but the average size of an MP3 song should vary from 3 MB to 7 MB.