System audio files appearing in playlist I wasn't satisfied with the selection of sounds the phone was giving me for the alarm, so I installed ES File Explorer and picked out some ringtone sounds from the phone's system/media/audio folder. Ever since, those sounds have been showing up in the Music Player playlist.

How do I stop them from doing so?

I'm using the default music player on a Sony Ericsson Xperia X10 Mini Pro running Android 2.1.
Add a blank file named .nomedia in the folders containing music that you don't want to be seen in the music player. Media scanner ignores files in the folder with .nomedia file. I have never tried this on Eclair, but I guess it should work.

And yes, you may have to restart the device after this is done.

EDIT:

The restart is to trigger the Media Scanner to do its job. You can also trigger it by unmounting and remounting your SD card (which can be done from Storage Settings or by connecting it to your computer), or by using one of the "trigger-happy-apps" like e.g. SDrescan