ITunes Library not loading in other applications

Question

I m unable to access my iTunes music in iPhoto. I have foloowed the advice given by Apple:
To add music to a slideshow:
Hide
If you don’t see your iTunes library in the Source pop-up menu:
Try the following:
Quit both iTunes and iPhoto. Open iTunes first, and then reopen iPhoto.
If you recently installed iLife software, it’s a good idea to open each application in the following order: iTunes, iPhoto, iMovie, and then iDVD.
These applications use one another’s media libraries, and opening the applications in that sequence ensures that you see the most up-to-date versions of your music library, photo library, and Movies folder no matter which application you’re using.
If you still don’t see your iTunes library, try this:
Quit iPhoto, iMovie, iDVD, and iTunes.
In the Finder, locate your iTunes folder.
It is usually in [Home]/Music/iTunes or [Home]/Documents/iTunes. If it’s not there, search for it.
Open the iTunes folder and drag the iTunes Music Library.xml file to your desktop.
Open iTunes and create a new playlist (choose File > New Playlist).
Quit iTunes and open iPhoto.
You should now see your iTunes library when creating a slideshow.
The same thing happens in both iMovie and iDVD – no iTunes LIbrary available.
There seems to be something fundamentally wrong with my iTunes Library: I dont have an iTunes Media File folder, (which my Macbook Pro running Snow Leopard has).
My iMac (Lion) has the following path: Home/Music/iTunes/iTunes Music/and then a list of music which is not what is presently in iTunes, it is some previous state of my iTunes library.
The Macbook pro has the following path: Home/Music/iTunes/iTunes Media/Music/ and then a list of music which is as in iTunes.
iTunes itself works OK, although some files, mainly podcasts have become lost files which can't be played.
Any advice?

Answer 1

i have been running out of space on my hard drive because of my itunes library. i purchased an external and found a site outlining how to move it and did so. it calls for moving the main folder but not the album artwork or the xml file.
i open iphoto, create a photo slideshow and when i go to choose a song, it shows me the list but gives an error when i choose it. i had no problems previously, so i assume it's because the program cannot find the songs because the files are now on the external drive. i research and several sites say to delete the xml file and create a new playlist in itunes to redirect the files. this did not work and now i'm not sure what to do besides just moving it back to my hard drive and dealing with the space issues some other way.