And don't forget that the music notation is just a guide for the musician. The interpretation of 3/4 time will vary considrably with different cultures. Try playing along with an old fashioned drum machine that can only play Bomm-chick-chick while you sing The Mountains Of Mourne, and you'll quickly realise that the trinity of quarter notes in every bar of 3/4 time were not created equal. Play them with equal duration and prominence and you'll get a boring rendition. The structure of music notation is a handy contrivance to teach and learn music. The exact delivery will depend upon the culture, skill and sensitivity of the players.

Regards, John