In classical music, a musical work is written in music notation by a composer after which it’s performed as soon as the composer is glad with its structure and instrumentation. However, because it will get carried out, the interpretation of a music or piece can evolve and change. In classical music, instrumental performers, singers or conductors might progressively make adjustments to the phrasing or tempo of a bit.
From the Sixties onward, Western pop and rock songs are often in verse-chorus type, which is based around a sequence of verse and chorus (“chorus”) sections, with new lyrics for many verses and repeating lyrics for the choruses. Popular music typically makes use of strophic kind, sometimes at the side of the twelve bar blues. Harmony refers back to the “vertical” sounds of pitches in music, which suggests pitches that are played or sung together on the same time to create a chord. Usually this means the notes are played at the same time, although concord may be implied by a melody that outlines a harmonic construction (i.e., by using melody notes that are performed one after the opposite, outlining the notes of a chord).