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The Queen of the Night aria, known for its demanding vocal passages and dramatic content, is indeed classified as a solo song. This aria is performed by a single vocalist, typically in an operatic setting, and showcases the singer's vocal prowess and emotional expression. Its solo nature allows for a personal and intimate connection with the audience, which is a hallmark of operatic vocal performance.

In contrast, other genres listed such as orchestral symphonies, ballet performances, and choral pieces involve multiple performers or a focus on instrumental arrangements, which do not align with the distinct characteristics of a solo aria. The specific focus on a single voice in the Queen of the Night aria is what makes it a quintessential example of a solo song within the context of opera.