I have until now played not so much, but just the high tones are quite difficult to make, partly due to the cramp vulnerable attitude of Ocarina. My sister (who got the second Ocarina), but could in the shortest possible time different songs play freely and probably klinged. This confirms my fear that it was up to me, and not on the Ocarina. ;)
The bottom line is an eye-catcher for the showcase, where you can elicit the greatest songs of Hyrule with a little practice.