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This just combines multiple mp3's into one mp3 file. Basically it is a easy join for mp3's
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Do they have to be the same bitrate or both be constant/variable bit rate?
Ya it should work
What about the id3 tag? Won't combined.mp3 just get the id3 tag from 2.mp3?
The id3 tag could be anywhere, depending on the version. http://www.id3.org/FAQ so the tag and song durations that your player reads won't be updated for newly-larger file, but hopefully a good player will just keep playing the extra audio frames that come along.
surprising.
Actually, as for information on the id3 tag issue:
http://blog.danfego.net/2008/10/concatenatecombine-mp3-files/
(sorry, shameless plug :P)