Twelve-Bar Blues Starter
Composition scaffold · Classroom · Grades 6-12 · 25 to 40 min
Fill in the classic twelve-bar chord-and-phrase framework -- three four-measure lines, the first two matching, the third answering -- with your own melodic ideas over the given harmonic outline. Learn the most-used song form in American music from the inside, by building one.
The rights, in plain language
This is our own original composition scaffold — a structured writing prompt built on generic, public-domain musical forms and techniques, free to use, print, and teach at your school with no royalty and no fee.
Print as many copies as you need, and use it in your classroom and rehearsals — free, with no royalty and no fee. Keep the Free School Music credit on any handout you copy. For the full terms, see Licensing & rights.
How to use this composition scaffold
Hand it to a student for independent work, or walk the whole class through it together. Read it here, or print it — or save it as a PDF — straight from your browser. It is free, with nothing to sign.
What this scaffold is
A guided first composition inside the most widely used song form in American music: the twelve-bar blues. The scaffold gives you the harmonic FRAMEWORK -- three four-measure lines built on the I, IV, and V chords of your key -- and you write the melodic ideas that fill it in.
What you need
Blank staff paper or a notation app, a pencil, and a major scale of your choice (the underlying chord letters will follow from that key).
The template, step by step
- Pick your key and identify its I, IV, and V chords (in C major: C, F, and G) -- write those three chord names at the top of your page as your harmonic map.
- Line 1 (4 measures): over the I chord for the first two measures and the IV chord for the third measure (back to I for the fourth), write a short melodic idea using notes that belong to the chord playing underneath each measure.
- Line 2 (4 measures): repeat your Line 1 melodic idea over the SAME opening harmony pattern (I, then IV, back to I) -- the classic blues move of restating the opening line once before answering it.
- Line 3 (4 measures): over the V chord, then the IV chord, then the I chord (the turnaround), write a NEW melodic idea that answers Lines 1 and 2 and brings the phrase home to rest on the I chord.
- Play the full twelve bars through and notice the classic shape: state an idea, restate it, then answer it -- three lines, one satisfying arc.
Teaching tips
- Keep the chord map visible at every step -- the whole exercise is choosing melody notes that fit the chord playing under each measure, so students should always know which chord they are writing over.
- Encourage a bluesy flavor by allowing a lowered third or lowered seventh scale degree as a color note against the chords, if the class has covered that -- entirely optional, and the plain major-scale version works fine too.
- Say clearly that this is a FORM, not a song. Thousands of different original pieces share this exact twelve-bar structure; filling it in with your own melody is exactly how the form has always been used.
Extensions
- Add a simple bass line outlining the I, IV, and V chords underneath the melody for a two-part piece.
- Trade turnarounds: have students swap their finished Line 3 (the turnaround) and perform each other's endings on their own Lines 1 and 2.
- Twelve-bar round-robin: as a class, take turns improvising a NEW Line 3 over a shared, already-written Lines 1 and 2 on the board.
What it builds
A working, hands-on understanding of chord-based song form and how a melody relates to the harmony underneath it -- the same skill that underlies composing or improvising over any chord progression a student will meet later.