Scott, I never did answer your question, "What are its (Nashville Number System) advantages?"

In no particular order of importance:

You can transpose keys just by writing them in at the top.

Almost any song can fit on one page.

You can see the structure of a song. You start to see common patterns in phrasing.

Use it for a while and you start to have a working understanding of music theory.

As Nite said, it's all about relationships (wait a minute, that's what MAB says too LOL.). The relationship of notes in a key can be seen expressed as numbers.

It helps you learn your keys.

You don't need staff paper.

##############################3

Disadvantages?

It's harder to write a melody with it than it is with standard notation.

Players who can't improvise are screwed.

You don't get chord voicings, only what might be in the bass.

You can't charge as much writing these as opposed to transcribing in standard notation.

You've got to really know your keys.

It gets sneered at by Nashbashers.

You've got to know your limitations. I don't know what your limitations are. I found out what mine were when I was twelve. I found out that there weren't too many limitations, if I did it my way. -Johnny Cash

It's only music.
-niteshift

Mike Dunbar Music