What's a Bar?
A bar (measure) is a small chunk of musical time. Most pop songs use 4/4 time — 4 beats per bar. Sections are usually built from tidy phrase lengths like 4, 8, or 16 bars, because that grouping feels balanced to our ears. These are conventions, not hard rules.
Basic Song Structure
Putting It All Together
A complete song uses all six pieces above, in this order. Learn this sequence — it's exactly what you'll be asked to rebuild next.
Ready to test yourself?
Head to Build — we'll shuffle those same six pieces and you put them back in order.
Arrange the Song
These sections got shuffled. Tap them in the right order to rebuild a complete, working song structure.
Piano
Click/tap a key, or play it on your keyboard — the letter row is white keys, the row above is black keys, just like their position on a real piano.
Chord Challenge
The glowing keys on the piano above show the chord's notes before you play them. Match them all to pass. Get through all 9 to finish.
Play a Song
Finish the Chord Challenge above to unlock this — once you know all 9 chords, you can play a real progression with them.