This is an exceedingly tricky thing to define since everyone praises the music from their time. I noticed this very strongly when I went to a home where elderly people lived, and as most people would guess, they were watching tv and listening to music from their time when they were younger. Music has to do more with our emotional state of the time listening than anything else. Sometimes, even if music is bad, we associate it to something personal that is happening to us at the time. So, it's relative. What I will agree with is what is happening in a larger scale. Like movies, music is a gamble and so much investment is needed, so they prefer to produce some formula that they know will sell instead of quality. No one wants to take huge risks anymore.