The comparison was recently used to gauge which type of music would lower stress levels. Mozart and Strauss beat out the Swedish pop band hands down. No surprise, but it seems the study was conducted by Hans-Joachim Trappe und Gabriele Voit of Ruhr University Bochum could have used a far better pop/rock band. Their work was published in the journal Deutsches Ärzteblatt International under the title The Cardiovascular Effect of Musical Genres.
Find the details here: http://www.limelightmagazine.com.au/news/mozart-and-strauss-beat-abba-lowering-blood-pressure