How to get a more crystalline sound on the guitar

Many students ask me how to get a more crystalline sound on the guitar.

Two important aspects:
1-Touching with nails is undoubtedly 90% of the brightness.
2 – The way you press the strings with your left hand fingers is also decisive. If you tread the strings but drown the rest you do not tread, you will always have an opaque, lifeless overall sound.