How to Convert a Large Batch of m4a to mp3

Question

The other day, I wanted to burn a CD with MP3 files, using iTunes, so that I could listen to music on my MP3 player in my car, but when I tried to burn a particular playlist, about 50% of the files would not burn because they were in the M4A format. (i.e. files I purchased and downloaded from the iTunes store).
I needed to convert these files in a batch, because I have about 64GB of music, (having ripped my previous CD collection onto my hard drive) and I have better things to do, than converting each one individually, like driving around in my car, listening to music.
Here’s the basic method that I finally devised (see below for more detailed instructions): 
Display the “Song” view in iTunes and sort by Kind (i.e. file type)
Select all the AAC Audio files (m4a)
Right Click and select “Create MP3 Version”
Delete the AAC Audio files (m4a) & empty the trash (m4a files will be deleted from your hard drive)
The AAC Audio files will now show up as being available to download from iTunes (a cloud icon with a down arrow), but you can hide these files by selecting “View” à “Hide Music in the Cloud”.
Now you can burn a CD without being concerned about the file format.
There are a few things that you have to check/set in order to make this method work:
First, you need to set the view, so you can see the cloud status and the song file type:
Open iTunes and select “Songs”
From the top menu, select “View” à  “Show View Options” or Cmd + J
In the View window, ensure “iCloud Download” is selected in the “Music” section and that “Kind” is selected in the “File” section.  (you may have to click on the down arrow to expand these areas in the View window.)
Select “Sort by: Kind” at the top of the View window or click the “Kind” column heading in the Song List.
Second, you will have to set the conversion type to MP3:
Open iTunes Preferences (cmd + , )
Under “General Preferences” under “When a CD is inserted:” click the “Import Settings” button.
Under “Import Using”, select “MP3 Encoder”
Additional Notes:
Removing the iCloud Songs (downloadable) in iTunes:
You can also select all the “iCloud” files/tunes and delete them.  You will get an error message:
“Are you sure you want to hide these items in iCloud?  These items will be hidden from your iTunes in the Cloud purchases.”
If, at some later date, you want your AAC/M4A files back, you can re-display them so they can be downloaded.
Retrieving the Hidden iCloud Songs:
Open iTunes Store
Click on your iTunes account and select “account”
Logon to your account
Under the “iTunes in the Cloud” section, IF you have hidden purchases, you will see “Hidden Purchases”, select “Manage”
Click the “Unhide” button or select “Unhide All” at the bottom
Log out of your account and return to your library and the Songs List.  You can now sort your list by the clicking on the “Cloud” heading icon to see all of your files that can be re-downloaded.
Click on the Cloud Download icon and the AAC Audio File (.m4a) file will be copied to your hard drive.

Answer 1

1 - select the photos in iPhoto and click "e-mail"
Or 2 - select the photos and export them to a folder (file menu Export) and right click (control click) on the folder and select compress [folder name] and then attach that folder to an e-mail
LN