What software can play these EMI files?
The Yahoo Music Jukebox (in the US) can play them, as can Winamp Pro. Windows Media Player 11.0, as it ships, cannot.
What if my music player can't handle .aac files?
You can convert DRM-free .aac files to the format of your choice. To convert to MP3 in iTunes, go to Edit/Preferences and choose the Advanced tab (see picture, opposite). On the Importing tab, under Import Using, choose MP3 encoder. Then choose a bitrate below that under Setting. After that, head to your library, right-click a song and choose Convert Selection to MP3.
What about my current iTunes music? Can I upgrade 128kbps songs to the higher quality level?
Apple says you'll be able to upgrade existing music by paying the cost difference, 20p per song.
Can I share DRM-free music?
The technology won't stop you, but the same copyright laws that make sharing music illegal still apply.