In our previous lessons, we've established a strong foundation. You've become familiar with BandLab's piano roll, learned to identify all 12 notes, and even entered your first melodies by placing notes on the correct pitches. We've mastered the vertical axis of the piano roll: pitch.
Now, we'll turn our attention to the horizontal axis: time. This lesson marks the beginning of your journey into rhythm, a fundamental element that gives music its pulse and movement. We will focus on identifying the most common note durations—whole, half, quarter, and eighth notes—by looking at their length on the piano roll's grid. Understanding this visual language is the first step toward creating the compelling, repetitive patterns that are a hallmark of composers like Ludovico Einaudi.
The Grid: Your Musical Ruler
When you look at the piano roll, you see a grid. This grid isn't just for alignment; it's a precise map of musical time. The horizontal axis is divided into equal segments called bars (or measures).
In most of the music you'll create, including Einaudi-style pieces, each bar is made up of four main beats. This is called 4/4 time. Think of it as a steady count: "one, two, three, four... one, two, three, four..." This pulse is the canvas on which we'll paint our rhythms.
The grid lines in BandLab show you exactly where these beats fall. The darker vertical lines often mark the beginning of a new bar, while the lighter lines show the beats and smaller subdivisions within it.
From Bars to Notes: Understanding Duration
Musical notes have different lengths, or durations. These durations are defined by how much of a bar they occupy. A note's duration is represented visually in the piano roll by how long the colored block is.
The following resource provides an excellent visual introduction to note values within a MIDI grid, which is exactly what we use in BandLab. It will help you connect the abstract idea of "note length" to the concrete image of a block on the screen.
Music Theory for Computer Musicians – Part 3
This chapter from "Orchestral Music School" clearly explains how note lengths are represented in a DAW's piano roll. It's a perfect visual guide for what we're learning today.
Please read the section titled "Note Value and its Length". Pay close attention to the descriptions and the image in Figure 1.13, which shows the standard note durations stacked on top of each other. Focus on understanding the relationship between the names (whole, half, quarter) and their visual length as they divide the bar. You can stop reading at the part discussing pauses.
As you've just read, we can define the basic note durations by how they divide a single bar in 4/4 time:
- Whole Note: This is the longest standard note. It lasts for the entire bar (all four beats). In the piano roll, a whole note is a block that stretches from the beginning of one bar to the beginning of the next.
- Half Note: As the name implies, a half note lasts for half a bar (two beats). You can fit two half notes perfectly into one bar.
- Quarter Note: A quarter note lasts for one-quarter of a bar (one beat). You can fit four quarter notes into a bar. This is often the basic pulse of a song.
- Eighth Note: An eighth note is half as long as a quarter note, so it lasts for half a beat. You can fit eight of them into one bar.
This system of division is the key to rhythm. All rhythms, from the simplest to the most complex, are built from these fundamental blocks.
Adjusting Note Length in BandLab
Now that you can visually identify these durations, let's look at how you create them. In the previous lesson, you used the Pencil tool to place notes. When you click to create a note, BandLab gives it a default length. To create the specific durations we've just discussed, you simply resize that note block.
This next reading will show you the exact technique.
MIDI Programming in BandLab: Complete Guide (2026) - Audeobox
This guide from Audeobox provides a practical, to-the-point explanation of how to edit notes in BandLab. We will focus on the specific action of changing a note's length.
Find the section "Drawing and Editing Notes." In the subsection "Drawing Notes," focus on the instruction that explains how to adjust its length. This is the core mechanical skill for controlling rhythm in the piano roll.
As the guide explains, you simply grab the right edge of a note with your mouse and drag it to make it longer or shorter, aligning it with the grid lines to achieve the precise duration you want.
Practical Exercise: Building a Rhythmic Ladder
It's time to put this into practice. This exercise will solidify your ability to identify and create the four main note durations.
- Open BandLab and create a new project with a single Instrument Track (choose a piano sound).
- Double-click in the track to create a MIDI region and open the Piano Roll.
- Bar 1: The Whole Note
- Click to create a note on C4 at the very beginning of Bar 1.
- Drag the right edge of the note so it fills the entire bar, stopping exactly at the line for Bar 2.
- Bar 2: Half Notes
- In Bar 2, create a note on D4 at the beginning of the bar. Drag its edge so it stops at the halfway point (beat 3, labeled "2.3").
- Create a second note on D4 right after the first one (on beat 3) and make it last for the rest of the bar.
- Bar 3: Quarter Notes
- In Bar 3, create four separate notes on E4. Each note should be one beat long. Place them on beat 1, beat 2, beat 3, and beat 4.
- Bar 4: Eighth Notes
- In Bar 4, create eight separate notes on F4. Each note will be half a beat long. You'll place notes on the beat (e.g., 4.1, 4.2) and also on the subdivision between the beats.
When you're done, your piano roll should look like a ladder of progressively shorter notes. Press play and listen. You'll hear how the visual length of the notes corresponds directly to how long they sound.
Conclusion
In this lesson, you've unlocked the second dimension of musical composition in a DAW: rhythm. By understanding how the piano roll's grid represents time, you can now not only place the right notes but also give them the right duration.
Here are the key takeaways:
- The horizontal axis of the piano roll represents time, which is organized into bars and beats.
- A note's duration is shown by the length of its block in the piano roll.
- The fundamental note values are the whole note (1 bar), half note (1/2 bar), quarter note (1/4 bar), and eighth note (1/8 bar).
- You can change a note's duration in BandLab by dragging the right edge of the note block.
You now have the ability to identify and create notes of specific lengths. In our next lesson, we will build on this skill by learning how to combine these different durations to create your first rhythmic patterns, bringing your musical ideas one step closer to the expressive pieces you aim to compose.