Jump Blues Rhythm and Horn Arranging: Two Saxes, Six Voices

The rhythm section is the engine, not the backdrop

Between roughly 1949 and 1954, small jump bands in Detroit, Chicago, Kansas City and Los Angeles worked out a division of labor so clean that you can still hear it in any good blues band today. Every player owns one job, and nobody steps on anyone else’s.

The bass owns the quarter note. The drums own the subdivision. The piano owns the shape of the chord and the left-hand boogie. The guitar owns the gaps, chopping short chords on the offbeats or slipping in a single-note fill when the singer takes a breath. When the horns arrive, they sit on top of a floor that is already moving.

We rehearse that division of labor before we rehearse a single note of melody. If the four-piece rhythm section cannot make a room want to dance with the horns out in the parking lot, adding horns will not fix it. If you want to hear how it ends up on tape, the reel notes on our home page list the tempos for every take.

The upright bass slap-triplet pocket

On an upright, a slap is a string pulled up and released so it cracks against the fingerboard. In jump blues that crack lands on beats 2 and 4, right where the snare drum lands, and it makes the bass sound like it has a second drummer inside it.

The “slap-triplet” part is the little ghost note just before each slap. Count the beat in triplets: “1-trip-let, 2-trip-let.” The bass plays a full note on the “1,” skips the “trip,” and plays a short, muted note on the “let.” That ghost pushes the line toward beat 2 and gives the whole band a forward lean without anybody speeding up.

To learn it:

1. Set a metronome to 120 BPM and put it on beats 2 and 4 only. Play walking quarter notes and slap on those clicks.
2. Add the ghost note on the third triplet of beats 1 and 3. Keep it quiet. If you can hear it from the back of the room, it is too loud.
3. Raise the tempo ten BPM at a time. At 170 the ghost note is barely 110 milliseconds long. Your hand needs to be relaxed or it will clip.
4. Add the drummer. Lock the slap to the snare. When they disappear into a single sound, you have it.

When we record, we capture the bass acoustically, in the room with the rest of the band. The slap leaks into every microphone on the stand, and on a two-track tape that leakage is what glues the sound together.

Shuffle swing ratios, in milliseconds

A shuffle is a stream of eighth notes where the first note of each pair is longer than the second. The ratio between them is the swing. Three ratios cover almost everything you will play:

• 3:2 (60%) is a light lilt. Fast tunes and horn-led swing sit near here.
• 2:1 (67%) is the triplet shuffle. It is the center of the style and the default for most 12-bar blues.
• 3:1 (75%) is the hard, dotted shuffle. It sounds heavy and sleepy, and it only works at medium and slow tempos.

The table shows long and short eighth in milliseconds (long / short) at five tempos.

Look at the 200 BPM row. A 3:1 shuffle leaves a short note of just 75 milliseconds, which is too quick to play cleanly on most horns. This is why fast jump tunes drift toward 3:2 on their own. Players are not getting sloppy. They are adjusting to what their tongues can do.

Two horns that sound like six

A tenor and a baritone are only two voices, but a careful arranger can make them behave like a section. These are the tools we use most.

1. Guide-tone shells

Every dominant seventh chord is defined by two notes: the third and the flat seventh. Together they form a tritone. Give the tenor one and the baritone the other, and the ear fills in the rest of the chord, with the bass and piano supplying root and fifth. Moving from one chord to the next, the two notes each slide a half step, which sounds smooth and inevitable.

2. Octave doubling

When the tenor and baritone play the same riff an octave apart, the pair sounds like four horns. The baritone’s low notes give the riff weight, and the tenor’s upper notes give it bite. For extra heft, have the baritone double the bass line for a chorus, then pull out for the next one. Pulling out is a bigger gesture than adding.

3. Staggered entrances

If both horns come in on the beat, you have two horns. If the tenor enters on the “and” of 1 and the baritone answers on beat 2, you have a conversation, and a conversation sounds like a larger group. Stagger the cut-offs the same way.

4. Shout choruses

Late in the tune, drop everything but the rhythm section and have both horns punch the same short rhythm together: dah, dah, dah-dah. Rhythmic unity makes two voices sound like a wall. Keep the shapes short and the rests long, and the room will do the rest.

5. Scoops and falls

A short scoop into a note or a fall off the end of one makes a section feel alive. Two players doing the same fall in unison convince the audience that there are more horns than there are.

A chart to try tonight

Here is a 12-bar blues in concert G with the rhythm-section chords and the baritone’s guide tone. Use it for the first chorus, then repeat with the tenor and baritone swapping roles.

1. G7bari F
2. C7bari B♭
3. G7bari F
4. G7bari F
5. C7bari B♭
6. C7bari B♭
7. G7bari F
8. G7bari F
9. D7bari C
10. C7bari B♭
11. G7bari F
12. D7bari C

Written pitches change by horn, so run any key you need through the transposer. The Bb tenor and Eb baritone transposer on the home page shows both parts at once, and the full set of five keys is in the bench calculator.

Rehearsal checklist

• Settle the shuffle ratio before the first downbeat. Count it aloud if you have to.
• Bass and snare lock first. Horns enter after the floor is steady.
• Cut-offs matter as much as entrances. Agree on where each note ends.
• Write dynamics. Two horns at one volume is a single sound. Two horns at three volumes is a section.
• Rest. A jump band leaves a lot of space, and the dancers need it.