Michel - Hopefully you are aware that there is "No Single/Universal Standard" for what information is present in IDV3 Tags, or those held in the Vorbis Comment Block, nor is there a single/universal standard for how that info is held on the physical CD. Quite a lot of time, especially if you allow your CD-Ripping Software to "fill in the tags from an Online Database" you may end up get wrong or incomplete tag information; mainly because those Databases are not adequately curated. To give you an idea of wrong/incomplete information look at attachments 1 & 2. The 1st screenshot is a CD where the online database lookup was "switched of" so what is shown is the info from CDPlayer.ini, i.e. The data/tags that is held on the Physical CD. The 2nd Screenshot shows what happened after I pressed the "Update from Online Database" button. Not only did the "Online Database" not have the Mix/Variant information it had the wrong "Artist" for track 8.
However; regardless of which set of tags you accept, a "Lyrics Lookup" (in most media players) will find the Correct Lyrics for Track 1; because the bit in the () brackets is part of the title. but if you remove the bracketed part of the title it will probably fail. However if you were to use the data from "CDplayer.ini" to populate the tags the lyrics lookup would probably fail on most of the other tracks that have () bracketed Mix/Variant/Featured Artist info as part of the title. But there is a way, and it involves a little bit of manual effort, which will make it more likely that any "Online Lyrics Lookup" will return the lyrics for a song/track, if one or more of the sites being searched has them. It's called replace the Curved Brackets() around any Mix/Variant info with Square Brackets[] and to remove any/all references in the title that refers to a featured artist. "A Song (featuring Fred Blogs) by A Solo Artist" is not a proper title but "A Song by A Solo Artist feat Fred Bogs" is a proper title, Indeed regardless of which Online Music Site you use to obtain your info you will inevitably find that "A Solo Artist" did nor record or release a Track Called "A Song" but "A Solo Artist feat Fred Blogs" did!. Most of the time the featured artist is added to the title for convenience, I've frequently seen incidences where on the CD the featured artist appeared in the Artist Tag but within the Track Name on the Printed Insert - The source of the info/tags which invariably gets loaded up to Online Databases if that site has no previous knowledge of that Disc/Album
However there are a pair of characters that sometimes occur in Track Titles/Names that invariably fail to result in a match when searching an on-line database that you are searching using the Track Name/Title; it's the Single And Double Quote Marks. If they are in the Vertical Style that you find on most UK/USA keyboards they will match on most sites, but if they are the Angled/Slanted Variants they will invariably fail to match. Even MC, and most other media players, will not consider two track by the same artist where the only difference in the track name is 1 has Vertical Quote Marks and the other has Angled/Slanted Quote Marks as Duplicates.
I'd love to know where you got data that led you to believe/assume - "I would venture that 95% of songs that have text within parentheses in the "Name" field are extra text"
My Music Library contains 44137 Tracks of which
2674 tracks have part of the title contained in curved brackets
1363 tracks have the featured artist in the Artist Tag and not the Title Tag
6758 tracks have additional Mix/Variant information contained within [] brackets in the Title Tag, including over 300 track that also have part of the track name in curved brackets
But only 468 tracks have no lyrics in them at all - either because neither MC or Media Monkey did not find them on the sites they search or because I failed to find them when doing a manual internet search. Oh and less than 10% of that 468 had either () or [] brackets, or even both, in the Title.
However if MC was to adopt your "Drop everything in parenthesis suggestion" and I for some reason I lost my music library and had to start again the number of tracks that MC was unable to find lyrics for would be around 25% of those tracks and not 95%.
If there is a single Media Player that can access every web-site that contains Lyrics for every track that has ever been recorded I'd love to know which one it is - MC does a reasonably good job of finding those lyrics which are available on the sites it searches; as does MediaMonkey which searches some sites that MC doesn't; but those searches will only "work effectively" if the "search parameters are in a format the site(s) being searched recognise"