Looking For Dataset Of Songs Sorted By Repetitiveness

Hi. I’m a desperate psychology PhD student looking for experimental stimuli for one of my experiments. I am studying how repetition in music is linked to cognitive mechanisms and how it affects aesthetic appraisal.
As the title says, I am looking for a dataset or database of songs/melodies/auditory stimuli that can be sorted from the most repetitive to the least repetitive. Looked everywhere but could not find one that suits my needs. Stumbled upon FMA but I am a bit lost in all the programming lingo and I don’t seem to find what I need in there.
Any lead would be appreciated, thanks in advance!