@oristarA,
Because the plural...(s) Implies that there is much more diversity...That helped cultivate the existence of A2K...Over the many, many years...To be as world known as you have said in your original question...
If you said word...Or song....
It sets A2K on more limits...And is saying that it is based upon word and song alone...
Which it probably would not be restricted to that alone if it is that famous in 2050....
In fact, if it is....The speech would probably contain many things that A2K will have in it...Over the many, many years....That may be incorporated into A2K, and the internet....That do not even currently even exist yet....
But it terms of just the question you have asked...The more diversity that is implied and incorporated into a speech of something that is that well known...and has done so much...Is better, and more accurately describes this website...So long it is not an untruthful statement....Which they are not...There are millions of words...And thousands of songs that help cultivate the diversity of A2K that makes it as great as it currently is....
If you say word and song...It does not imply as much diversity....
And if A2K grows that famous in 2050....It is going to be millions and millions of different words that made it what it is....As well as thousands and thousands of songs....And probably many, many more things...Including videos...Pictures...And things that do not even exist yet...Or things we have not harnessed....and such...