Songs managing system using tags, for SongA ft. B

iPhone5 was not coming this time,,,, now the latest is iPhone4S, hmmm...
but the only portable mac thing i have is... older version of iPod nano... (though i use mac book...)
When i use iPod, i sometimes feel bothersome to choose songs like "SONGNAME ft. FEATURING"

cos i want to listen to the song that is sung by A, but that song's artist name is "A feat. B" or something like that....

then, if we could have a tag system for mp3 players, then the song can belongs to both A and B....

then the management would be easier....
i dont know weather i could make u understand or not....

fig. changing properties that a song has

fig. songs that artists have

this time, artist name are something like tag, though all properties could be something like tags...

Thank you for reading :)
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