You need to have installed iReal Book Editor for Mac version 0.4 or higher.

1. Open the Mac editor
(if it is already open, close any tunes you do not want to add to the composite list, as it adds all open tunes)
2. Open your tune(s) you want to add to this specific post
3. In the forum, find the relevant post you are adding to and click on the tune(s) link; (all the tunes contained in that link will open into Mac editor individually. They come in all with the file name "untitled" but ignore this)
4. Click on All Songs to Forums; (this gathers all open tunes into the clipboard for pasting as one composite)
5. Enter the composer (or band) name when it asks for a Playlist name, press OK
6. either click Open Forums button; then navigate to the relevant post again; or click Cancel, and return to the relevant post...(the forum—topic page is probably still open)
7. Post Reply for the thread you are appending to
8. Click in the text area, Paste then Submit. The (play)list will automatically be generated at the bottom with all the names of the tunes contained therein.
9. To close all the tunes in Mac editor, press command-option-w (if you had not saved your own tune(s) it will ask you to save/name them in irb format as a normal computer file) but the forum "untitled" tunes will disappear.