"That's why these songs have lasted as long as they have because they're just about feelings that don't change. They are love songs, they are not specific, those kinds of feelings don't change"

This quote by Diana Krall talks to the timelessness of particular types of songs. She is referring to enjoy tunes, which have actually been around for centuries and will likely continue to be popular for centuries to come. The factor for this is that the feelings related to love don't change. Individuals have been in love, and will continue to remain in love, for as long as people exist. Love tunes are not particular to any specific time or place, and so they can be enjoyed by people of all ages and backgrounds. This universality is what makes them so long-lasting and why they have actually lasted as long as they have.