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→Don't Get Ahead of Yourself
Notice in the table of all the intervals I've included columns for Just Intonation Ratio, Just Intonation Cents, and 12-Tone Equal Temperament Cents. If you don't know what the hell I'm talking about, don't feel bad. The J.I. Ratio merely indicates roughly how harmonic each interval sounds, with the smaller ratios more harmonic than the larger - this follow the experience of playing the tab above.
[[Equal Temperament and Alternate Tunings#Cents|Cents]] are a strict measure of relative pitch that are covered way later on. Each semitone covers 100 cents - each octave spans 1,200 cents. This measure is often used for tuning strings, but applies well for understanding intervals and harmony. I merely want to pique your interest now - guitar is a fun instrument in allowing us to play with pitch and harmony in ways other instruments cannot. Mastering the instrument goes beyond simply knowing the strict intervals listed above but knowing the math and core concepts of harmony as well as how to achieve this in your playing.
For now you should be mainly concerned with the sound and names of the intervals, not the pairs of notes involved in the tab. For example, you should know what a perfect 4th interval sounds like in comparison to a minor 3rd, but not worry about knowing that E-A is a perfect 4th and E-G is a minor 3rd. ''That will come with time. Don't stress!''