File Filtering
The files can be filtered on a regular expression, such as: +\.mp3, .*hip hop.*\.mp3 for all MP3s with "hip hop" in their name, or filename to display a specific single file name.
Don't forget that this uses regular expressions: a specific single file name may thus be filtered on as follows:
\(Feels Like\) Heaven - Fiction Factory\.MP3
The regular expression is applied case-insensitively.
You can also use file filtering to support other file types:
+\.(mp3|flac|occ)
But be aware that the standard Flash player may not support this (workaround).