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my $str = "The Police";
$str =~ s/ /+/;   # read between the slashes: space becomes +
print "$str\n";

$str =~ s/ /+/g;  # use this one ;)

my $escaped_artist = $FORM{songartist}; 
$escaped_artist    =~ s/ /+/g;
...
...
print FILE "<a href=nap ... (like you had before)
print FILE "$escaped_artist - $escaped_title</a>\n";