What makes you think we'd even have classical music? It's likely that many classical composers were in fact SPs. (For example, I've seen Mozart typed as an ISFP.) Classical music may seem boring to us today but imagine if you were living in the 14th century. Now that's BORING!
Very true. I mean, who still speaks like this...
Unto this angel spak the frere tho:
Now, sire, quod he, han freres swich a grace
That noon of hem shal come to this place?
Yis, quod this aungel, many a millioun!
And unto sathanas he ladde hym doun.
--And now hath sathanas,--seith he,--a tayl
Brodder than of a carryk is the sayl.
Hold up thy tayl, thou sathanas!--quod he;
--shewe forth thyn ers, and lat the frere se
Where is the nest of freres in this place!--
However, language takes a long time to evolve. And knowing how to properly manipulate grammar is an important skill to develop for more efficient communication. If meaning is lost than language looses it's purpose.