Smetana's "The Moldau," depicted several scenes related to the main river of Bohemia, so it is an example of: Program music.
Music can be defined as the combination of an instrumental sound and human vocals, so as to produce nice tunes or sounds that are harmonic in nature.
A program music refers to an instrumental art music that comprises extra-musical narrative and meaning, in order to convey the impression of past events or evoke images (scenery) in the mind of its listeners.
In this context, Smetana's "The Moldau" is an an example of a program music because it depicts several scenes related to the main river of Bohemia.
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