Paul Lamere posts different spellings of “Guns N’ Roses” and “Tchaikovsky” from ID3 tags. Here are the top twelve for “Guns N’ Roses”:
Guns N Roses
Guns and Roses
guns ‘n’ roses
Guns ‘N Roses
Guns & Roses
Guns’N’Roses
Guns N’Roses
Guns’N Roses
Guns´n Roses
Guns N´ Roses
Guns -N- Roses
GNR
You’ll need to go to the posting for the “Пётр Ильич Чайковский” variants.
Most Casual Observer 
well, search engines that don’t index punctuation will match most of those?
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Mostly I wanted to share the post because even anecdotal lists of these things are so rare.
The ones with “and” or “&” will be a problem. There is also a question of whether the quote is deleted or turned into a space. Does “L’Avventura” become “L Avventura” or “LAvventura”?
I also think the wide variety of straight and curly quote usage is interesting, along with the correct version showing up as the 11th most popular.
Finally, these are all entered into metadata, not a quick query, so people are making some attempt to get it right. This is more like cataloger agreement for amateurs than like search, or maybe like differences in spelling for web pages instead of queries.
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