The title of this composition mentions the main theme, which is built on combinations of three notes: A, D, and Es (alias to E-flat). In various combinations they may sound very different. Like this:

Or like this:

Or even like this:

The title theme does not appear right away, it is preceded by an introduction. Then the main theme is first introduced as a viola solo, then developed by the other voices and then the introductory theme comes in again.

This piece has one peculiarity that was discovered in the course if its virtual orchestration: it exposes the deficiencies of virtual instruments in a most cruel way. While some other compositions are quite tolerant to mediocre VSTs and sound acceptably, A.D.Es sounds terrible. So, it appears to be a helpful testing tool for virtual orchestration libraries.

And the instruments in question are:

• 2 flutes
• 2 violins
• viola
• cello