NOTE: for macOs 10.9, 10.10

Sibelius 7 Sounds is no ordinary bundled sample library. This collection combines exclusive content with hand-selected sounds from industry experts to bring you more than 38 GB of professional-quality sounds covering every instrument family?from a complete symphony orchestra to specialist sounds like handbells and a 27-stop church organ.

http://www.sibelius.com/products/sibelius/7/professional_sound_library.html