us this data and i was looking through it and what i discovered was that in the lower left hand corner of each page, one of the sets of data had single whole notes. and i think the ones by the students usually had four quarter notes. so that, in fact, it was possible to distinguish between these two classes of… of pieces of music just by looking at the lower left… lower right hand corner of the page. so, i told this to the… to our scientist friend and he went through the data and he said: ‘you guessed right. that’s… that’s how it happened to make that distinction.’ 