Tip of the day : Alfred's Essentials of MUSIC THEORY

Hello David,

Far be it from me to contradict you but my viewpoint is that the software program with the same title is more pleasant to use. I bought both and the content is exactly the same. You haven't to choose between Mac and Windows, the cd-rom works for both. There are two ISBN on the box. Here are they :

ISBN-10 : 0-7390-6861-X
ISBN-13 : 978-0-7390-6861-8

Hope that can help.

Best,

Eddy