I listen to some cd 1,200 times in a 7 years period for example ( Heinrich Schutz Geistliche Chormusik 1964 Dresden Mauesberger, Vivaldi opus2 sonatas in trio etc)I wrote at this times and use some cd each day for years like a pill for creation without being bored....I guess I am a different animal....I like variety tough, I listen music in all styles, countries, and periods....
I listen very often to some of my best 100 cd or files, amongst the thousands in my library, these best files are so sublime to communicate a specific emotion that I cannot live without listening to them periodically....
For me, some musical work are so high in their emotional content powerful expression, that most other works are almost boring compared to them....Then looking for some variety that rivals my other best files, I was in the obligation to scan all periods, styles, and countries...My "best of" is distributed in all genres...I dont like for example heavy metal in general, but even there I discover some best powerful expressive stuff....
For me music is medicine for my health, food for thinking or meditate, and drugs activating creation device, and emotions feed back machine from ecstasy to excitation and melancholy, and sometimes and at least, a very simple joy.... :)