Tremolo

This is a very difficult technique to master. Let´s see an example:

     p  a  m  i  p  a  m  i
E-|-----0--0--0-----0--0--0--|
B-|--------------------------|
G-|--------------------------|
D-|--------------------------|
A-|--------------------------|
E-|--0-----------0-----------|
 

This means play the low E string with your thumb and then the high E string three times in rapid succesion, using the ring, middle and index fingers respectively. To make the transcriptions shorter, a different method is used to represent the tremolo, like in "El Ultimo Tremolo", transcribed by David Atkinson. He represents it like this:

 
E-|--t0--t0--t0---|
B-|---------------|
G-|---------------|
D-|---------------|
A-|---------------|
E-|--0---0---0----|
 

Which means the same thing as above. To make it easier to understand I have included a little WAV file (Extracted from Agustin Barrios' "Una Limosnita por el Amor de Dios") so you can hear how it sounds like. Be patient, it's one of the most difficult techniques of the guitar.

Tambora

The tambora is a technique that started with brazilian and spanish guitarists. Its closed charasteristic sound is obtained by plucking the first string with the thumbnail. This, combined with the left hand changing chords boosts the variety and versatility of this technique. It's a little difficult to explain in words, so I´ve included this WAV file extract from Agustin Barrios' "Aconquija", so you can hear how it sounds like...

Harmonics

The harmonics are a common thing for all string instruments (Violin, guitar, harp, etc...). An open guitar string has some points that when in vibration, produce a light sound called "harmonic". The best harmonics in the guitar are produced in the 3rd, 5th, 7th, 9th, 12th, 15th and 19th fret. The way to get the sound is to lean a left hand finger over the fret WITHOUT pressing, then playing the string with the right hand and then releasing the left hand to mantain the sound. In the following table you can see which note is produced in each harmonic in each string:

*The 3rd fret really produces two harmonic sounds, one directly over the fret and another one about 1/2 cm. after it.