Thanks for all the answers. I do not watch TV so reading and listening to audiobooks are my evening entertainment. I will say that I started out listening on my MP3 player and my computer. I have added my smartphone and my Nook HD+. I do re-listen to audiobooks though. I do not know how many different titles I have. I do know that I have over 220 GB of titles that are not Audible. These are mostly titles I got from the library(average 8-12 discs), put on my MP3 and then when I was done I left it in iTunes. Then the library went to Overdrive, so I haven't been able to do that anymore.
There is so much that I have not been able to run iTunes as it freezes up all the time. Tried WMP and have the same issue. I guess I will need to start a Audio Library in Calibre. Then take them out of the media library and only leave in the one I am listening to. This will hopefully help.
Auntykatkat