As a medical experiment. We wanted to know what effect sustained exposure to the El Lay supergroup would have on a rat's central nervous system. The results (see E. Blalock, T. Farsical, U. Failure, et al, "Baleful effects of Eagles Music on Laboratory Rats", New England Journal of Medicine, vol. 53, January 2012), were positively alarming. Most of the rats either curled up and died or chewed their own ears off, something we scientists conducting the experiment didn't think was even possible. On the other hand, a small subset of the subjects adapted to repeated listenings of "One of These Nights". They sprouted ponytails, and when allowed to pull either a lever containing food or a lever containing turquoise jewelry, invariably choose the latter. We noticed that they were sluggish (the so-called "Peaceful Easy Effect") for a period of 12 to 24 hours, then fell to bickering amongst themselves over (1) who deserved songwriting credit for "Hotel California" and (2) who was going to get to sit next to David Geffen in his Laurel Canyon hot tub. They finally moved to separate ends of the cage, where each commenced work on a solo album.
Next month we plan to reproduce the experiment using Rush music. We're interested in seeing if you can induce Geddy Lee Syndrome (i.e., the tendency to sing Ayn Rand-inspired lyrics in a piercingly high voice) in laboratory rats. Thus far the syndrome has only occurred in humans who have had long-term exposure to the group. We'll keep you posted.