Why will iTunes not play?
well it depends on what kind of computer you use
If you copy files to iTunes Library, you will have 2 copies of the file on your computer. iTunes can play files that are not in the iTunes Library. It makes a link to them, like an alias. For example, if you download a song, it might be in your downloads folder. If you let iTunes copy it to the iTunes Library, it will be in your downloads folder and your iTunes Library. If you…
Is there a program that can be used to convert movies slash videos purchased on Itunes into a format recognized by a media player other than Itunes WMV AVI etc?
Yes. Many people are confuse about why it is unable to play iTunes video movies songs on other media player. Because iTunes media are under iTunes DRM protection and it can be play in iTunes only. If you want to play them without iTunes media player, you need to remove DRM protection and convert them to plain WMV AVI or MP3 file formats.
Is there a way to keep music on iTunes with leaving in a mass storage device which has the music on it?
Yes, the iPod will play .mp4 and .mp3. .mp4 files are iTunes songs as you originally downloaded them, and .mp3 files are either converted files that you converted in iTunes or files that you did not get through iTunes. The iPod supports a variety of audio formats: AAC, Protected AAC (from iTunes Store), HE-AAC, MP3, Audible, Apple Lossless, AIFF (as found on CDs), and WAV.
iTunes will not play ogg vorbis files. You would need to either convert your OGG files to MP3 or AAC to play them in iTunes or you would need to download and install a player like VLC Player in order to play the ogg vorbis files without converting them. Similarly, ogg vorbis OGM files would need to be played in VLC Player.
Yes some can. But some can't from what I've heard. If you download songs from the internet onto iTunes, you just have to make sure iTunes can tell you have your mp4 player in. If not it can't download them. If the music has been converted to play in iTunes then those files cannot be played by all mp4 players (the format is different).
Most mp3 players cannot play itunes songs because itunes songs are mostly in mp4 format. The ipod is the only player that can play mp4 formats. There are songs that are mp3 formats in itunes, though. Because itunes is its source for music, itunes only recognizes ipods, but if you download correct software for the mp3 player, it should be able to recognize the mp3 player.