To join the files together:
mp3wrap OUTPUTNAME FILE1.mp3 FILE2.mp3 FILE3.mp3 ...To add ID3 tags:
id3tool FILE.mp3 -t "TITLE" -a "ALBUM" -r "ARTIST" -y "YEAR"
id3v2 FILE.mp3 -t "TITLE" -A "ALBUM" -a "ARTIST" -y "YEAR"As the man page for mp3wrap states, don't mess with the comment ID3 tag, as mp3splt needs it if you want to recover the individual files.
It seems that sometimes iTunes/iPod will stop playing these joined MP3s at the end of particular tracks, for some reason.
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The opposite (mp3split?) would be terrific to use with podcasts.
mp3splt is there, but it only works on files that have been concatenated with mp3wrap (or albumwrap) as it needs the metadata stored by those tools in the ID3 comment tag to know how to do the splitting.
mp3DirectCut (Windows) is good for splitting MP3s by hand though: http://www.mpesch3.de/
Seems like the utility of this would be in simplifying the interface with each player. It's a lot easier to make sure that a single MP3 is copied over to a player than to make sure the player playlists include a whole collection of files.