Yup, when I bought my almost new 99 in 2001 it had a rather large 8 or 10 CD changer in the left saddlebag. I don't recall what brand it was, but it was controlled via the handlebar controller. Worked great, but since my co-pilot claimed the Right side bag and most of the trunk for her gear on our longer trips and left me with the Left bag (of which the CD changer took up a third of the space) to accommodate all my gear plus tools, it was quickly removed and replaced with Satellite radio....
