A bridge in a song is a section of music that provides a new and fresh sound to the listening ear. From pop songs to rock anthems and hip-hop tracks, bridges can be found in various genres of music. Regardless of the genre, a bridge adds that extra layer of creativity and intrigue to keep the listener engaged and prevent the song from becoming predictable or monotonous.
If you want to learn what is a bridge in a song in more technical terms, you should get yourself familiar with something called the “song system”. Basically, a song system is a combination of the repetitious parts of a song which are the verse and the chorus.
The chorus and the verse are the parts that stick to the mind most. So, if you are hanging out at your favorite café and suddenly find yourself asking what song is playing at that given moment and searching for the lyrics on the web, the section that sticks to your memory is often from the verse or the chorus of the song.
And usually, the structure of a song follows the AABA pattern with a repetition of verses and choruses. This shows that the human ear enjoys a little bit of a change after the repetition of two systems in a song - and this is when the bridge comes in. A bridge injects novelty and variation into the musical composition by introducing new melodies, lyrics, or chord progressions to instantly capture the listener’s attention.