Sal Caruso Design


Apps for Music Students, Singers, Musicians, and Music Aficionados


This is an evolving business, focusing our attention on creating easy to use music theory apps.  The iOS (iPhone Operating  System) allow us to present music theory in a intuitive way that simplifies learning.

Introduction - A little music theory

Music is all about sounds and rhythms. Keys are groups of notes and chords that form a scale and a range of sounds. Each key has a unique set of notes and unique set of chords. Notes played sequentially form the melody of a song. Chords which are made up of three or more notes played in unison, form the harmony of a song. It is the mix of melody, harmony and rhythms that add richness to a song.

If you have any questions or comments, please email us:

We have two music theory apps in the App Store.

- MScales: This app describes the scales (notes) in each of the major keys.

- Keys-Chords: This app describes the chords in each of the major keys.

In addition, each app has a Transpose View that shows you how to transpose, (to convert) your music from one key to another. (i.e. from the key of C to the key of B.)

Be sure to look at the Nashville Number System. It is in design and may be available some time in the future.

Use the links on the top of the page to take you to a description of each app.