Chantal,

have a look at 
http://lucene.apache.org/java/3_0_1/api/all/org/apache/lucene/search/similar/MoreLikeThis.html
More like this  to have a guess what the MLT's score concerns.

The problem is that you can't compare scores.
The query for the "normal" result-response was maybe something like 
"Bill Gates featuring Linus Torvald - The perfect OS song".
The user picks now one of the responsed documents and says he wants "More
like this" - maybe, because the concerned topic was okay, but the content
was not enough or whatever...
But the sent query is totaly different (as you can see in the link) - so
that would be like comparing apples and oranges, since they do not use the
same base.

What would be the use case? Why is score-normalization needed?

Kind regards from Germany,
- Mitch
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