If you want to filter by a criterium that is separate from a Genre, that criterium can't be part of the Genre tag. So Zybex's advice is correct: you need an additional field.
The field he suggested is one way. It's intuitive, but very special-purpose. If you think of new use cases, you'll need more new fields. I'll suggest something a little more flexible.
I have a field called [Special Handling]. This is a list field, so it can contain multiple values.
I use this field throughout all the views of my library, as needed, to modify the way the files as included or displayed. If Special Handling contains this, then do that. If Special Handling contains this other thing, than do this different thing here. And so on.
In your case, just put Audiophile in it.
You end up with one extra field instead of many, and you can use it in many different situations.