Musical Plagiarism

I think I remember to have heard, two or three years ago, of an action for damages brought against an eminent composer, on account of plagiarism in a musical composition; and that the defendant's argument was founded on the fact, that there exist very few really "original compositions," if originality excludes every form of plagiarism. And he adduced as examples the "See the conquering hero," of Handel; and the "Zitti Zitti," of Rossini. Can any of your readers refer me to the minutes of this trial; and tell me if any book has been published in criticism of the originality of composers?