The Structure Inspector is yet another “rapid” part of RapidComposer. You can use it to build Parts of your Composition, and copy/paste new ones, and rearrange them on the fly. Each Part can have its own key, tempo and time-signature that all override the global Composition settings. On the previous page, we changed some settings in the Structure Inspector window (we picked a key, a tempo, and a time signature). Now let’s go over how RC Compositions are structured, within this very important (and powerful) window.

When you first start RC, you see your “entire” Composition. Within this Composition are “Parts”, and within those “Parts” are “Lines.” When you start a new Composition, you only see one part, and one line, like this:

The key, tempo and signature is displayed for each part or line that changes it! Important: key, tempo and signature are inherited by parts from the composition, and lines inherit these from the parts, so lower levels in the hierarchy inherit higher level settings. However they can also override them!

When you click on a Part or Line a few buttons appear that allows you to add/duplicate/delete a part or line:

Once you’re a little more familiar with RC, you might come up with a Structure that looks like this…

You can easily add new Parts (and rename them to something logical such as “Verse” or “Chorus” or “Pre-Chorus 1” or “Chorus 2” if you want) and you can add new Lines to those Parts (Lines are automatically named Line1, Line2, and are tied to each Part they are made from). You can edit one Part at a time, by double-clicking its name in the Structure Inspector. Right-clicking opens the Master Track Inspector where you can set up the scale, tempo and signature for the selected line or part. Remember, these properties are inherited from higher levels if you don't override them. If you created a line you can change its length by adding bars and beats in the Timeline Inspector. You can also delete a few bars to make it shorter by making a selection on the timeline and pressing Delete.

Let’s take the screenshot above. The 28-bar Composition has five separate Parts. Notice also how there are a total of seven Lines beneath these five Parts. If you’re still confused, please see our Part 7 Tutorial video “Structure Inspector” at

More about Parts/Lines: Say you have a Part with a Line that’s four measures long. If you add another Line to that Part, that Part is now a total of eight measures long (Line 1 is the first half of that Part, and Line 2 is the second half of that Part. Both Lines can be different bar lengths & have different chord progressions, if you want!). Seems complicated at first, but the more you use it, the easier it gets.