Question about the parameter's name being repeated throughout its function

I was wondering this too. I get what you are saying about the parameter being a placeholder and that from the "perspective" of the computer the name of the parameter is unimportant. What I still don't quite understand is how this code runs properly even though the parameter name is repeated throughout the loop. For example in

function printSongs( songs ) {
  var listHTML = '<ol>';
  for ( var i = 0; i < songs.length; i += 1) {
    listHTML += '<li>' + songs[i][0] + ' by ' + songs[i][1] + '</li>';
  }
  listHTML += '</ol>';
  print(listHTML);
}

we have "songs.length," "songs[i][0]," etc. I would think at least these would need to say "playList.length" or "playList[i][0]," yet the code runs fine.

My question is, would it be accurate to say that when an argument is passed to a function, any time the parameter's name is repeated throughout the duration of the function, the computer treats it as though the parameter's name is that of the argument until the function ends?