I remember starting out. Clearly remember barre chords being the big hurdle. I almost gave up cause it was so hard to play an E then move it up the neck without losing formation.
But once you can play an E barre chord and an Aminor shape anywhere on the neck - you can almost play any song so I can see why some people get barre chords down then just stop
learning anything else. But get all the campfire chords and barre chords down then you can almost play any song with the help of a capo !
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I did a music degree and studied theory for 3 years - but I still couldn't tell you WHEN to use an augmented chord. I just know what it sounds like and why it resolves and yadda yadda...
Of all the articles and things I read about Music Theory, each one has helped me in a very different aspect, the one important thing is this...Music Theory is the language created to understand Music. There are no rules to music. Only what sounds fitting, it's why the Locrian scale isn't used because it's really disharmonic, and to our human ears, it doesn't sound "good". But it could still be used.
So, using an Augmented Chord is all up to you and if you feel the song needs that augmented chord, either for transitional smoothness, or for effect of the song needing the augmented chord to portray a certain mood of the song, then by all means go for it.
One thing I did learn that really helped me in creating my own songs, and actually playing random stuff and sounding decent enough, is Chord Progressions. Understanding this concept really has helped my playing.
Not all students are the same (obviously). An adult learning to play the guitar will struggle more because the joints and tendons in the hands are less flexible whereas a younger persons hands will adjust to chord voicings more easily.
Now I completely agree about "rock on" and play what you want but I am not saying become a classical guitarist, I'm saying start out learning on a classical guitar for about 6 months to a year especially for a young kid.
Nylons are great for younger kids. The strings aren't as tough on the fingers, and they can play a bit better.
I will say this though, having an understanding of Basic Music Theory can help you immensely. Not only in playing guitar, but in playing other instruments. Once you understand Theory, it's a lot easier to grasp the concept of each musical instrument and their roles in the overall Staff of Music. Learning this on a Piano, also helped me understand the roles of Guitar and Bass. How the Guitar can use notes, that the bass can not (or else it sounds muddy). Which leads me to another important Theory Lesson, Voicings. Once I got that concept down, it helped me understand the roles of the Bass and the roles of the Treble. How the Bass is different from the Treble.
So I would say, Understanding Theory, Voicings, and Chord Progressions, are the trinity to helping one compose songs of their own.
I've played and practiced Chord Positions all over the guitar, and found out the chords for some songs. The way that happened was, I would play that chord in a certain position, and while playing it I'll notice and say "Hey, that's the chord for this song".
Knowing these 3 things has also helped me in doing what I enjoy doing for fun, and that is creating mashups.
One fantastic example of this is when I first heard
One Day by Matisyahu, I instantly noticed it sounds a lot like
Waving Flag by K'Naan (The original album version, not the remixes). So in my undertaking of making the mash up and wanting to actually play the mashup myself, and make it my own blend of the two songs, I discovered they use the same exact key and chords, only in a different progression. Matisyahus' progression is a simple progression, while K'Naans' is a bit more complex. Here is the mashup I edited together from the two songs. It's the best way to get the idea of what I want My Mashup to sound close to.
K'Naan/Matisyahu One Day Waving Flag (Mashup)