Pronunciation: [sˈa͡ʊ͡ə nˈə͡ʊt] (IPA) 
"Sour note" is spelled with the phonetic symbols /saʊr/ for the word "sour" and /noʊt/ for "note." The "s" in "sour" is pronounced with a "s" sound, while the "ou" is pronounced like the "ow" in "now." The "n" in "note" is pronounced normally, while the "o" and "e" form a diphthong pronounced like the "o" in "no" followed by a short "i" sound. The final "t" is pronounced with a "t" sound.
A sour note, in its literal meaning, refers to a harsh or unpleasant sound produced by a musical instrument or voice, characterized by discordance or off-pitch tones. It is a term commonly used in the field of music to describe a dissonant or out-of-tune sound that disrupts the harmony or melodic line of a composition. A sour note can be introduced by a performer's mistake, lack of skill, or simply by chance.
In a figurative sense, a sour note is used to depict an undesirable or unpleasant element or occurrence within a particular context. It is often employed to describe a jarring or discordant aspect that contrasts with the overall positive or harmonious atmosphere of a situation. For instance, in a social or professional setting, a sour note can refer to an awkward, inappropriate, or poorly received comment or action that spoils the general atmosphere or taints the overall impression.
The term "sour note" can also be used metaphorically to express an unfortunate or unsatisfactory outcome or occurrence, such as an unexpected turn of events or an undesirable consequence. This may apply to various aspects of life, including relationships, business ventures, or personal experiences. In these cases, a sour note indicates a setback or disappointment that hinders the overall positive course of events or disrupts the expected outcome.
Overall, the term "sour note" encompasses both musical and metaphorical meanings, highlighting a discordant sound or undesirable element that is out of tune with the intended harmony or favorable outcome.
The etymology of the phrase "sour note" can be traced back to the musical expression "sour chromatic" or "sour tone", which originated in the 18th century. In music, a sour note refers to a discordant or dissonant sound produced when a note clashes with the harmony or melody being played. Over time, the term "sour note" expanded beyond the realm of music and came to be used figuratively to describe any negative or unpleasant event or comment that disrupts an otherwise smooth or harmonious situation.
