The many CD's by J. Liliedahl, both Art Lesson CD's and Masterpiece Project CD's, contain oil painting lessons that were developed to teach, develop and "hone" the craft of painting for developing artists. They are for use only on a computer and are NOT videos/DVDs.

In contrast, the CD's by David A. Leffel and Robert A. Johnson contains hundreds of images that capture each artist's paintings in progress during their demonstrations, and contains the text of the artist's comments during the painting.

They are intended to show the step-by-step progress of the demonstration painting, and to provide the associated comments during the process, as no video exists for these painting demonstrations and each artist believes that the CD is a valuable reference that shows both brushwork and overall progress, in slow motion, that would not otherwise be available.