“Don’t Know Why” is known for its relaxed, jazzy sound.Norah Jones combines influences from jazz, folk and blues, resulting in a gentle, timeless style.The song is about love and loss.The lyrics express a mix of longing and confusion over the end of a relationship.The refrain “Don’t know why I didn’t come” conveys an emotional uncertainty.Due to its popularity, "Don't Know Why" has been covered by various artists.The song has also been used in various films, television shows and commercials, contributing to its continued presence in pop culture.The song is often considered one of their most distinctive and well-known pieces.

Sheets: https://www.musicnotes.com/sheetmusic/mtd.asp?ppn=MN0285295