DJ Cassio (!empty($user->lang['WROTE'])) ? $user->lang['WROTE'] : ucwords(strtolower(str_replace('_', ' ', 'WROTE'))):
I add new music everyday single day to a category called New Music it stays there until a track plays at least once or 1 week. Then it gets moved automatically via PAL to a regular music category. Not hard to find all my new music since it is in it's own category. No longer new after a week.
I also used a category NEW, but within this I had to make 10 NEW sub-categories for each sub-genre to make it possible to select new music from the correct genre. While there is a field genre in a track. Not mentioning the other usable fields like mood, bpm, etc... but is a different discussion. From a searching point of view, to add new music this way is indeed easy, but reviewing the tracks and editing queues etc, it was not manageable for me. New music is not played once or one week, at least one month but good scoring tracks could last several months. So moving them to a main category with scripting is possible, but here the DJ's want to decide which one goes from new to main regular play rotation...