Wirelessly posted (Opera/8.01 (J2ME/MIDP; Opera Mini/3.0.6306/1558; en; U; ssr))
Alt+lglg to clear logs. Scroll to your media icon and look over your music and whatever else you want to remove. If it's default stuff you want to remove......try doing so via your desktop manager. Might or might not delete.
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There aren't many commands like this - there is an excellent Tips and Tricks sticky thread FAQ at the top of the General BlackBerry Discussion forum and a few people (like mod Stinsonddog) have excellent tips documentation.