There[SQ]s no known software or application widely recognized as "Lovely Composer" specifically for Windows. It[SQ]s possible :

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It[SQ]s a very niche or obscure program:

Many small, independent programs exist that don[SQ]t have broad online visibility.
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The name is slightly different:

Perhaps there[SQ]s a typo in the name, or it[SQ]s a similar-sounding application.
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It[SQ]s a newly released program:

Newly released software may not yet have a substantial online presence.
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It[SQ]s a private or internal tool:

Some companies develop internal applications not available to the public.

To find it, you[SQ]d need to provide more information, such as:

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Where did you hear about it?

(A website, advertisement, friend, etc.)
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What does it do?

(Is it a music composer, a code editor, a graphic design tool, etc.?)
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Any other details about the software?

(Developer name, website, any screenshots)

With more information, it might be possible to identify the program you[SQ]re looking for.