In case anyone else is also interested in the "what kind of music", this is straight from the study:

>>The patients were asked to choose their preferred music from two prerecorded instrumental musical pieces instituted as the music therapy. We used non lyrical, soft, slow tempo, relaxing instrumental musical pieces of either flute [click here for audio]or piano [click here for audio]as the choices presented to the patient.The musical pieces were selected based on their slow and meditative tempo (60-100 beats per minute), and only non -lyrical instrumental piano or flute based versions were chosen.The flute version which was preferred by most patients was a combination of Raga Yaman and Raga Kirwani. Raga Yaman is bright and uplifting and Raga Kir wani is known for its soothing and calming effects. Combining these two Hindustani classical ragas provides musically uplifting qualities that could be helpful in reducing the stress associated with surgical procedures and control the hemodynamic responses to surgery. Noise cancelling headphoneswere used to play the instrumental pieces at 60db. The musical piece was played for the entire duration of the surgery on loop using blue tooth connectivity of the headphones with a mobile phone.<<