Are there any orchestras that incorporate the mezzo-soprano voice?

Question: Are there any orchestras that incorporate the mezzo-soprano voice!?

I need to find two websites for orchestra's that incorporate the mezzo-soprano voice, but am having no such luck!. If there are none please let me know!. ThanksWww@QuestionHome@Com

Best Answer - Chosen by Asker:

Orchestras don't usually include singers!. Some works call for singers, but they're generally either soloists or part of a choir!. For instance, Elgar's massive work "Dream of Gerontius" includes an orchestra, choir, bass soloist, tenor soloist and mezzo-soprano soloist!.Www@QuestionHome@Com