Why can't I clear the "Composer" field for tracks in my music library on my iPhone? I downloaded some music tracks from the iTunes Music Store and synced them to my iPhone. While browsing the music on my iPhone, I realized the "Composer" field was filled in with the names of the musicians who wrote the songs. However, I only use the "Composer" field for classical music, and leave it blank for non-classical music, so I went back to iTunes and deleted the contents of the "Composer" field for each track, and re-synced. iTunes showed that the files were being updated, but when I looked on my iPhone, it still had entries in the Music app's "Composer" tab. So I went back to iTunes again, and changed the "Composer" field for each track to "Blah", then re-synced. As expected, there was now only a "Blah" composer entry in the Music app. I then deleted the contents of the "Composer" field again (in iTunes) and re-synced. Lo and behold, there was still a "Blah" composer entry in the Music app! So then I unsynced all my music from my iPhone, and re-synced it—and there's still a "Blah" entry!

What do I have to do to get the Music app to recognize that the tracks don't have a "Composer" field anymore?! (iTunes must be one of the most frustrating pieces of software Apple has ever made.)
I don't understand why this is happening to you. My songs are set up the same way (classical has composer info, others do not) and the transfers are fine back and forth with my iPad and iPod when I edit the Composer field.

If you have a Mac, you could try this.

Drag a music file from iTunes to the desktop. Delete the file from iTunes and your iPhone and sync and make sure it's gone. Then drag the music file back to iTunes (with the iPhone powered down) and edit it. Drag it to the desktop, delete from iTunes and put it back, making sure that all the details are as you want them. Then sync to the iPhone.