Using AppleScript with Toast to burn MP3 disc

Question

I'm trying to get Toast to add all the subfolders of a chosen folder to a new MP3 Disc. The attached script works fine except it adds the source folder, then puts all the subfolders inside it.
IE Disc layout becomes
Source Folder
----> subfolder 1
----> subfolder 2
How do I add just the subfolders of folderSelected?
set folderSelected to choose folder "Select a folder"
tell application "Finder"
set folder_name to name of folderSelected
end tell
tell application "Toast Titanium"
activate
set myDisc to make MP3 disc
set name of myDisc to folder_name
add to myDisc items folderSelected
end tell

Answer 1

Sorted it with a small code change:
set folderSelected to choose folder "Select a folder"
tell application "Finder"
set folder_name to name of folderSelected
set sourceList to every folder of folderSelected
set NoOfFolders to number of items in sourceList
end tell
tell application "Toast Titanium"
activate
set myDisc to make MP3 disc
set name of myDisc to folder_name
repeat with j from 1 to NoOfFolders
add to myDisc items (item j of sourceList as alias)
end repeat
end tell