What does it mean when it says Em when reading music tabs?

It means it is an E minor Chord. On a guitar this chord is formed with your middle finger on the 2nd Fret A string and your ring finger on the 2nd Fret D string.

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What is the Nashville Number System?

The Nashville Number System was developed by the Jordanaires who were session musicians in Nashville during the 60s. A number is given to each chord. The advantage is you can write a chart for a song without knowing what key it will be played in. Also, You can write charts quickly using the Nashville Number System. Many musician use Arabic numbers while others use Roman numerals. Designating the chords with Roman numerals has actually been around much longer than the use of Arabic numbers in Nashville. The advantage of using Roman numerals is the major is designated with upper case while minor is lower case. The table below shows the chords and corresponding number for all 12 major keys.

I ii iii IV V vi vii

C Dm Em F G Am Bdim

G Am Bm C D Em F#dim

D Em F#m G A Bm C#dim

A Bm C#m D E F#m G#dim

E F#m G#m A B C#m D#dim

B C#m D#m E F# G#m A#dim

F# G#m A#m B C# D#m E#dim

C# D#m E#m F# G# A#m B#dim

Ab Bbm Cm Db Eb Fm Gdim

Eb Fm Gm Ab Bb Cm Ddim

Bb Cm Dm Eb F Gm Adim

F Gm Am Bb C Dm Edim

good question? I would like to know who made up some of the Grammatically correct answer are was that a question?

their is two E string and More E notes along the fret board, why the Em on the second fret 5th and 4th and also 2nd fret 4th and third also

there's a barred Em 7fret 8th-4 finger 2 string 3 finger ninth- and pinkie on ninth fret