This collection from Sibelius gives you all the sounds you'll need to write rock and pop music in Sibelius 4. It includes samples of 108 pitched instruments from guitar, keyboards and drums to horns, strings, voices, and even a Hammond B3 organ plus 20 drum kits. There are well-known instruments like a Fender Stratocaster guitar and Rickenbacker bass, and multiple samples are provided for many of the instruments, with different styles and tones so you can get just the sound you're looking for. You can even export an audio file to create a CD of your music, or convert to an MP3 file.
System requirements: 3.2 GB hard disk space (in addition to Sibelius); Windows XP (or some Windows 2000 configurations); Mac OS X 10.3.9 or later; DVD drive; Sibelius 4.1 or later.