Notes foreign to tonality can be used to add tension or interest to a piece of music. They can also be used to create a sense of dissonance or instability. In some cases, notes foreign to tonality can even be used to create a sense of humor or irony.
The use of notes foreign to tonality is a common technique in jazz, blues, and other forms of improvised music. It is also used in some classical music, especially in the music of the 20th century.
Here are some examples of notes foreign to tonality in popular music:
* The song "Imagine" by John Lennon is in the key of C major. The note F# is used as a note foreign to tonality in the chorus, creating a sense of tension and longing.
* The song "Strawberry Fields Forever" by The Beatles is in the key of B major. The notes A# and D# are used as notes foreign to tonality in the verse, creating a sense of unease and uncertainty.
* The song "Bohemian Rhapsody" by Queen is in the key of B flat major. The note F is used as a note foreign to tonality in the bridge, creating a sense of drama and excitement.
These are just a few examples of how notes foreign to tonality can be used in music. With careful use, these notes can add a great deal of interest and depth to a piece of music.