I foolishly looked at the Query Syntax Help file for help on formulating a query
<field> – A reference to a tag field. This can be either a plain field name (e.g. artist) or a title formatting expression (e.g. "%artist%"). See Notes for details.
All search expressions are non-case sensitive. All keywords must be uppercase.
$info(name)Returns value of technical information field called name.For convenience, the %__name% alias is also available.[…]tool | Tool used to produce the file, possibly guessed (e.g. LAME3.97)