Traditional electromagnetic pickups are either single-coil or double-coil. Single-coil pickups are susceptible to noise induced by stray electromagnetic fields, usually mains-frequency (60 or 50 hertz) hum. The introduction of the double-coil humbucker in the mid-1950s solved this problem through the use of two coils, one of which is wired in opposite polarity to cancel or "buck" stray fields.
The black dots found on the chord diagrams tell you which fret to press down, and on which string and with which numbered finger. Additionally, you will sometimes see circles above the nut. These circles tell you to play that open string without pressing any fret. So using what we know so far about strings, finger numbers, and dots, let’s check out that same chord diagram again:

The California Conservatory of Music offers guitar lessons with the most qualified teachers in the Bay Area at both our Santa Clara and Redwood City schools. Whether you're looking to start your young child with Suzuki guitar lessons, preparing for a college audition, or getting reading for an upcoming concert, we can assist you. We offer the Bay Area’s most comprehensive guitar lessons which include technique, sight reading, music theory, and in addition to the private lessons, we offer ensemble, repertoire, and theory classes on the weekends. For students under the age of 8, we ask the parents to be involved in their guitar lessons and practice at home. To better help parents develop in to this role, the first three lessons are dedicated to the parent education class. The child can then begin their guitar lessons. This helps ensures the student’s success and motivation. 
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Adding a minor seventh to a major triad creates a dominant seventh (denoted V7). In music theory, the "dominant seventh" described here is called a major-minor seventh, emphasizing the chord's construction rather than its usual function.[27] Dominant sevenths are often the dominant chords in three-chord progressions,[18] in which they increase the tension with the tonic "already inherent in the dominant triad".[28]

Our philosophy is simple. We make learning music fun, and are committed to the integrity of a quality music education. In addition to a foundational education, students are given ample opportunity to make music with others. The confidence gained by learning music parlays with other areas, giving students the self-assurance to take on new challenges.
The lower strap button is usually located at the bottom (bridge end) of the body. The upper strap button is usually located near or at the top (neck end) of the body: on the upper body curve, at the tip of the upper "horn" (on a double cutaway), or at the neck joint (heel). Some electrics, especially those with odd-shaped bodies, have one or both strap buttons on the back of the body. Some Steinberger electric guitars, owing to their minimalist and lightweight design, have both strap buttons at the bottom of the body. Rarely, on some acoustics, the upper strap button is located on the headstock. Some acoustic and classical guitars only have a single strap button at the bottom of the body—the other end must be tied onto the headstock, above the nut and below the machine heads.
Guitars have been played since the Renaissance era, after descending from the ancient Greek instrument, the kithara. Or, at least, that's how the theory goes: the only real proof for this is the similarities between the Greek word and the Spanish word, quitarra. Early guitars often had four strings, evolving into the six-string version we know today in the late 1600s. Anton Stradivari, the famous violin-maker, also had a hand in making guitars. There's now only one Stradivarius guitar left in existence.