It seems that pop song titles have become shorter since the 60’s, indeed the number of words in song titles has decreased too. This process has accelerated since the advent of the download.
With everything available all the time the battle to be even noticed, let alone purchased, has become streamlined and more brutal. Why have three words in your title if one will do? Even if that diminishes what you are trying to say or has no bearing whatever on the message of the lyric?
Another technique to get your song remembered is just keep hammering the refrain . Thus the chorusless song (e.g. “Virgina Plain,” “Up The Junction”) is also in decline as songs become effectively one long chorus.
I don’t know what this actually means or portends mind you. Feel free to chip in.