These are MP3 guide tracks for each of the exercises (including alterations) in the book Money Notes: How to Sing High, Loud, Healthy, and Forever. This collection is pitched for a low male (baritone) voice.
Once you've opened the ZIP file, you can load these MP3 files into Garage Band or other music production software to customize even further. Ideally, each exercise is perfect for you - pitch and speed - to get the feel of the exercise and maximize how effective it is for you.