is a sequence of pitches and rhythms; it is also known as a tune.

Yes, that is correct. A melody is a sequence of pitches and rhythms that forms the main musical theme or tune in a piece of music. It is often the most memorable and recognizable aspect of a song.

Yes, a sequence of pitches and rhythms is known as a melody or a tune. Melodies can be found in various forms of music and are often the most memorable and distinctive element of a song or composition.