Thank you for your prompt reply
Yes the iTunes library was on the internal hard drive that went bad, there were no special settings just an alphabetical list of the music (much to my shame),
typically I had put off doing a proper sort out and just relied on time machine.
After running the back up all the files and Apps. seemed to load ok and iTunes loaded showing the total number of tracks 18,000+ including the track names but when I attempt to play some of the tracks I get the error "original file could not be found". I estimate that this is effecting approx 40% of the files. I always thought that a time machine back up was just that but obviously either I am doing something wrong or the files are screwed!
Incidentally I have just noticed that all the back ups between August 2013 and 4th. June 2014 will not open (the back-up date I used was the August one, which I had assumed had the best chance of repairing iTunes. Could it be that in using the the earliest one I could have screwed up Time Machine itself? (The June back up is around the day I attempted the re-installation.
Sorry if the above is a little rambling! but the loss of nearly 7 years worth of music is not a happy place to be in.
Regards,
BlackRockGuy