I'm not sure if there's a bug or I was just completely unlucky with the RNG, but it seems that NONE of the samples are from the winter. Maybe the sample did play some winter samples, but I've been clicking winter 30 times in a row and the score never increased. It did increase for spring and autumn (these two I am more familiar with musically).
But other than this scoring which felt a bit sketchy, the idea is awesome. I wish there was something like that for modern music. Like a pop quiz by playing like 2 seconds of the song.
In any case, really nice idea for the theme.