A song is a short poem or other set of words that are put to music and sung. It can be performed by one person alone (a cappella), a singer with an instrument or in a group of musicians including a solo singer, a duet or trio, and a larger ensemble such as a choir.
A good song makes a connection with the listener, is easy to remember and has lyrics that resonate. It also has a clear structure and rhythm, is melodic and has a strong hook. Great songs are often timeless and remain relevant 25, 50 or even 100 years after they were written. They are products of great craftsmanship, a result of careful attention to detail and a focus on the art form and craft of songwriting.
The chorus is the most memorable part of a song and typically includes a musically and lyrically catchy hook or riff. Choruses are usually longer than verses and a bit more energetic in tempo and musical dynamics. They may be built around a single motif that repeats throughout the song, or they might contrast with the verse – harmonically, rhythmically, melodicly and/or dynamically.
The bridge is a common song section that provides relief from the repetition of the verse and chorus by using different chord progressions, melody lines and / or tempo. Occasionally, the bridge will include different lyrics as well. For example, the classic rock song “Since U Been Gone” starts with a pre-chorus, which sets up the main melody in two lines of 2-bar musical phrases and repeats both the melody and the lyrics.