Is Music and Fashion Time-Dependent?

I've noticed that music from the 1970's and 1980's, quite frankly sucks.  And the same is it with clothing.  For God's sake, bury leisure suits, disco music, and hair bands.  Is this a new discovery?  Apparently not.  James Laver, a British art and fashion historian, noted and generalized on some common ways in which fashion is perceived: 

James Laver offered some Laws of Fashion:

The same costume will be:
- Indecent: 10 years before its time
- Shameless: 5 years before its time
- Outré (daring): 1 year before its time
- Smart- Dowdy: 1 year after its time
- Hideous: 10 years after its time
- Ridiculous: 20 years after its time
- Amusing: 30 years after its time
- Quaint: 50 years after its time
- Charming: 70 years after its time
- Romantic: 100 years after its time
- Beautiful: 150 years after its time

Well, Mozart's music is beautiful, Chopin's is romantic, and I will stretch and call the Charleston music charming.  But what is one to make of music that is 30, 40, or 50 years old?  I do not find disco to be amusing.  Especially "I Will Survive."