I found the tests easier the 2nd time round, and as others have noted above, my scores were higher too. Hmmmm ... that's probably because they use mostly the same set of tunes for the second set of tests -- a definite advantage for anyone who plays by ear. (or, I thought they were the same tunes, with some minor rhythmic changes - did anyone else notice this?)

And I'm wondering -- how many of you who got perfect scores studied ear training?

LIke a couple others above, I got 29/30 and 30/30 the first time, and perfect scores on both tests the second time   

BUT   

I'm a music teacher. I've supported myself my whole life by concentrating on music, training ears and eyes and hands, listening carefully enough to pick out and correct the 'wrong' notes, fix the timing mistakes, help with technique, style and expression etc. So, if I failed to get an exceptional score on (relatively) simple ear tests like these, I'd know I really missed my calling!

It will be interesting to see how my family does on the tests. So far,
results do NOT indicate a genetic component for musical perception/ability -- my mother just scored 20/30 twice, my father >20.

Not surprising at all imo -- their musical education and experience is MUCH more limited than my own (thanks to them!).

Still waiting on my kids and sibs, and I highly suspect the results will be much the same. I think everyone is born with musical 'talent' and ability. Some have the opportunity and motivation to develop their inborn musical potential. Others do not. A 'good ear' is a LEARNED skill, in my opinion. But we'll see -- it's studies like these that will eventually sort out the influence of nature vs nurture on musical behaviour.   Exciting stuff!   :-)