Flat-top or steel-string guitars are similar to the classical guitar, however, within the varied sizes of the steel-stringed guitar the body size is usually significantly larger than a classical guitar, and has a narrower, reinforced neck and stronger structural design. The robust X-bracing typical of the steel-string was developed in the 1840s by German-American luthiers, of whom Christian Friedrich "C. F." Martin is the best known. Originally used on gut-strung instruments, the strength of the system allowed the guitar to withstand the additional tension of steel strings when this fortunate combination arose in the early 20th century. The steel strings produce a brighter tone, and according to many players, a louder sound. The acoustic guitar is used in many kinds of music including folk, country, bluegrass, pop, jazz, and blues. Many variations are possible from the roughly classical-sized OO and Parlour to the large Dreadnought (the most commonly available type) and Jumbo. Ovation makes a modern variation, with a rounded back/side assembly molded from artificial materials.
The bass guitar (also called an "electric bass", or simply a "bass") is similar in appearance and construction to an electric guitar, but with a longer neck and scale length, and four to six strings. The four-string bass, by far the most common, is usually tuned the same as the double bass, which corresponds to pitches one octave lower than the four lowest pitched strings of a guitar (E, A, D, and G). (The bass guitar is a transposing instrument, as it is notated in bass clef an octave higher than it sounds (as is the double bass) to avoid excessive ledger lines.[jargon]) Like the electric guitar, the bass guitar has pickups and it is plugged into an amplifier and speaker for live performances.
The twelve-string guitar usually has steel strings, and it is widely used in folk music, blues, and rock and roll. Rather than having only six strings, the 12-string guitar has six courses made up of two strings each, like a mandolin or lute. The highest two courses are tuned in unison, while the others are tuned in octaves. The 12-string guitar is also made in electric forms. The chime-like sound of the 12-string electric guitar was the basis of jangle pop.
The pickguard, also known as the scratchplate, is usually a piece of laminated plastic or other material that protects the finish of the top of the guitar from damage due to the use of a plectrum ("pick") or fingernails. Electric guitars sometimes mount pickups and electronics on the pickguard. It is a common feature on steel-string acoustic guitars. Some performance styles that use the guitar as a percussion instrument (tapping the top or sides between notes, etc.), such as flamenco, require that a scratchplate or pickguard be fitted to nylon-string instruments.

This book is smaller than I thought it would be, but it's fairly thick. The book is 6.5 inches wide, 9.5 inches 'tall', and slightly more than 1 inch thick. It is not spiral bound and so it does not lay flat very well at all. After I located a song that I wanted to play, I tried to force the book to lay flat by pushing down on the spine. It didn't help much and it is frustrating when the book wants to close while you're reading it. I might have to take it somewhere to have it spiral bound. The songs are listed in alphabetical order which makes it easy to find the song you're looking for if you know the title. And here is the part that surprised me: The book contains lyrics, chord diagrams, and chord names "only". It ... full review
With the massive range of options available, you'd have to spend the whole day here to go through every one. There are six and twelve-strings, models specifically made for beginners, limited edition double necks; you name it, you'll find it! For a real classic, strap on a Rickenbacker 330 electric guitar. A staple in 60's mod culture, the unique hollowbody construction, slim neck and contoured body make the Rickenbacker 330 so easy to play that it has held the status as one of the all-time greatest guitars for decades.
All courses are available as instant downloads, on disc, or as streaming video on our website and mobile apps for iOS and Android. Study anywhere, anytime in the format of your choice. Interactive features and functions include standard notation, Power Tab, Guitar Pro, jam tracks, playback controls, video looping, slow-mo, tuner, metronome and other learning tools.
There are separate chord-forms for chords having their root note on the third, fourth, fifth, and sixth strings. For a six-string guitar in standard tuning, it may be necessary to drop or omit one or more tones from the chord; this is typically the root or fifth. The layout of notes on the fretboard in standard tuning often forces guitarists to permute the tonal order of notes in a chord.
I have heard how giving you are in so many respects of music schooling and I must say that I am impressed. You remind me of the pure idealism that we had in starting Apple. If I were young, with time, I'd likely offer to join and help you in your endeavours. Keep making people happy, not just in their own learning, but in the example you set for them. 
This unique degree program combines contemporary music performance training with the rigorous study of traditional disciplines including sight-reading, music history, arranging, conducting, recording and more. The comprehensive program instructs students to demonstrate stylistic depth, creative maturity and professional competence in preparation for careers in today’s music industry.