Note: this was written for a <duck> windows computer, and is not directly portable without a few edits... I run it as a service under win2k. You can also run it from command-line with -d, it will just process once and quit.

Note 2: For them what don't know, eMusic.com is a great DRM-free mp3 service. Their jazz collection is huge. They just don't offer much customizability in the naming of files, and I like mine [artist - album] 01 songname.mp3" hence....

#!/usr/bin/perl
# emusicfix.pl
#
# Will watch a specified folder for new MP3 files downloaded from emus
+ic.com
# and fix the filenames, then place them in their own directories by a
+rtist.
##################################################
# Dir where you want the artist directories created:
my $basedir        = "d:\\music\\";
# Dir where you will place newly-downloaded files:
my $watch        = "d:\\music\\em_save\\";
# Delimiter used by the filenames to separate artist, track etc.:
my $delimiter    = '-';
# Field orders:
# The default is for names like:
# Artist_Name-Album_Name-Track_Name-Song_Name.mp3
my %f = (
    artist    => 0,
    album    => 1,
    track    => 2,
    song    => 3,
);
# That's it!

my $count = 0;
my $debug = 0;

if ($ARGV[0] =~ /-d/) {
    $debug = 1;
    processdir();
} else {
    daemonize();
}

# You may want to consider running this as a service under win2k et al
+.
sub daemonize {
    while (1) { #run forever
        processdir();
        sleep 20;
    }
}

sub processdir {
    my (@list);
    $count = 0;
    for (@list = sort `dir /b $watch\\*.mp3`) {
        chomp;
        fixfile($_) unless ($_ =~ /.*File Not Found.*/i);
    }
    if ($debug) {
        if ($count) { print "Moved $count files\n"}
    }
}

sub fixfile {
    my $filename = shift;
    chomp $filename;
    die "Bad infile" unless ($filename =~ /\.mp3$/);
    my (@file) = split/-/,$filename;
    for (@file) {$_ =~ s/_/ /g;}
    my $newfilename = '['.$file[$f{artist}].' - '.$file[$f{album}].'] 
+'.$file[$f{track}].' '.$file[$f{song}].'';
    $newfilename =~ s/ s /\'s /gi;
    $newfilename =~ s/ m /\'m /gi;
    my $source = $watch.$filename;
    my $dest = $basedir.$file[$f{artist}].'\\'.$newfilename;
    if (! makedir($basedir.$file[$f{artist}])) {
        print "Skipping file, can't make dir for $file[$f{artist}]" if
+ $debug;
        next;
    }
    if (! -e $dest) {
        my $result = `copy "$source" "$dest"`;
        if ($result =~ /1 file\(s\) copied\./) {
            $count++;
            print "$dest [OK]\n" if $debug;
            $del = `del "$watch$filename"`;
            print "Error deleting: $del\n" if ($del && $debug);
        }else{
            print "Can't copy\n  $source  to\n  $dest\n" if $debug;
        }
    } else {
            print "Skipping existing $filename\n" if $debug;
    }
}

sub makedir {
    my $dir = shift;
    if (-e $dir) {
        return 1;
    }else{
        return mkdir $dir;
    }
}
[download]