What part of music is the recognizable melody of song?*

melody is a linear sequence of notes the listener hears as a single entity. The moelody of a song is the foreground to the backing elements and is a combination of pitch and rhythum. sequences of notes that comprise melody are musically satisfying and are often the most memorable part of  a song

Explanation:

changeable lenses of different focal lengths allow light to enter the camera, which then forms the image on light-sensitive film" is the one among the following statements about working principle behind a basic still camera is true.