August 24, 2018

Even if your band plays exclusively by ear, you won't last long if you don't understand Key theory. The first step is understanding there are twelve keys in Western music (plus three enharmonic keys that are sonically identical to one of the twelve). Each of these keys can be understood as a group of notes that share a common tonality. Can you say, "Plays well with others?" In order to have any idea which notes to play in a given piece of music, you need to know the diatonic scales and chords that make up that particular key. But how do we determine which scales and chords belong together? With the road map that follows, you will be well equipped to navigate without ending up in the wrong key.
Key Signatures

Have you ever noticed that the black keys on a piano appear in alternating groups of two and three, respectively? That is because the formula for the diatonic scale has two whole step intervals, one half step interval, three whole step intervals, and one more half step interval. The black piano keys rest between these intervals in a C-diatonic scale. If you play only the white keys, you end up playing in C major. In the following diagram, notice the key of C has no sharps or flats.

Key of C


Circle of Fifths


In each key, the diatonic scale begins on the tonic (or first scale degree) of the key, then follows the same sequence of intervals. So if you wanted to determine the G major scale, you would start on G and add six more notes, being sure to add the single sharp in the key signature: G,A,B,C,D,E and F#. The key of D has two sharps, so it is written: D,E,F#,G,A,B and C#. As you proceed clockwise around the circle of fifths, each consecutive sharp key adds another sharp in a pre-determined order. Traveling the opposite direction from C, you get F major: F,G,A,Bb,C,D and E. The great thing is that when you build a diatonic scale, all the notes fit perfectly into the key in which you are playing.

Notice that between the sharp keys and the flat keys, there are three overlapping enharmonic keys that have the same notes but two different names.

Diatonic Chords in Each Key

If you build a 7th chord starting on each degree of the diatonic scale, you will arrive at the diatonic chords which belong in that key. These also have a pattern, starting with a major chord on the tonic and proceeding according to the following formula: Cmaj7, Dm7, Em7, Fmaj7, G7, Am, Bm7b5 (key of C).

C Major

Notice in the illustration, capital Roman numerals indicate major chords and lower-case numerals indicate minor chords. To arrive at the diatonic chords in a given key quickly, write out the scale, then add the chord designations after each note. D major would be: Dmaj7, Em7, F#m7, Gmaj7, A7, Bm7, C#m7b5

This can be very useful information. Knowing the chords that belong to the key you are in makes transcription and songwriting much easier. You already know what is going to fit. "But lots of songs have chords outside the diatonic structure," you say. "What about those cases?" The old adage, "You have to know the rules before you can break them," applies quite well. Sometimes great music is built upon the unexpected. But without the expected, what would that mean? Of course, once you have built a progression based upon diatonic chords, you can play the matching diatonic scale over it.

No matter where you play, understanding key signatures and the diatonic scales and chords that comprise them will make jamming, songwriting, and transcription much easier tasks. And when you do choose to play "out" you'll know how to find your way back. In our next installment, we will learn how to use the Nashville Number System to communicate chord structure in any key with ease, as well as how to build your own chords and arpeggios from scratch.

Meanwhile, get some staff paper and write out all fifteen diatonic keys, their diatonic scales and chords. Before long, you will know your way around enough to say, "I can play it in any key!"

Also in Guitar / Bass Amplifier Info & Education

The Value of Learning a New Instrument
The Value of Learning a New Instrument

June 17, 2022

Whether you’re an old salty master or a beginner, there may come a time when you need some new energy to keep you inspired. When that time comes, it’s not a bad idea to pick up a new instrument – preferably one in an entirely different family. There’s a world of good learning a new instrument can do, so it’s worth a shot, even if it’s not easy.

Read More

Collaborating with a Band Member Who Moves Away
Collaborating with a Band Member Who Moves Away

June 06, 2022

Time was, if a band member moved, that was the end of the band. Serious acts might replace that member, and of course there are plenty of famous examples, but even then, things just aren’t the same. Then again, people moved around less (maybe). Now, the idea of keeping a solid group together for the long haul seems almost impossible. People move around all the time, and many successful live acts keep going by replacing or rotating pieces.

Read More

WG5 Wireless Guitar System Review by The Tone King

May 27, 2022

WG5 Wireless Guitar System Review by Tone King

The TONE KING reviews the Carvin Audio WG5 wireless guitar and bass system. The WG5 Wireless Guitar/Bass System is designed to give you the wireless freedom you have been looking for and the simplicity to make your life as a working musician easier. Compact design coupled with an intuitive, easy set up makes going wireless an enjoyable process. The WG5 works with both active and passive instruments.

Read More