Well i may have my mind strictly in the tonal world...but if it werent for the tonal world there would not be an (UGH) atonal one.
It worked quite well for hundreds of years so.......
All the worlds greatest pieces are tonal-the ratio of great works in tonality to those that aren't is EXACTLY 99.999% to .0001 %.
And i have taught viola...it was a requirement of the Arts high school i graduated from.