The phrase "Don't Know Why" most prominently refers to a popular song written by Jesse Harris and famously performed by Norah Jones. Released as a single in 2002 from her debut album "Come Away with Me," the song received critical acclaim, won three Grammy Awards, and achieved international chart success. It is known for its jazzy, soft vocal and piano style that set Norah Jones apart in the early 2000s music scene.
If the phrase "dont know why" was referencing something else, additional clarification would be helpful. However, the strongest association with those words is definitely this well-known song by Norah Jones. Let me know if a different context or meaning is intended.
