I would also say, each era has their character. An old song is memorable from the music and also the lyrics which is some of them are poetic and has a lot of meaning. we know the band or singer based on their true skills. for the sample, Axel rose with his vocal power also slash with his guitar, or Sting and Phill Colin's with their identical voice. let step back further, the Beatles with their simple song and lyrics but very memorable. The new song, which is a lot of digital music nowadays has a lot of repeated words but sadly some of them are meaningless (sorry it just my opinion lol)... But I must say, some of them also easy to listen or digested. as a sample, the Chainsmoker which is most of their music is produced digitally that is why some of the new song characters are remembered by their tunes as a sample Clean Bandit with their Symphony.