TEORIA MUSICAL(armadura de clave)

Each music key signature comes with a particular number of sharps and flats. These sharps and flats have a particular order as you will notice below.

Sharp keys, the number and order of sharps

C major has no sharps or flats.

G major has one sharp, F# D major has two sharps, F# C# A major has three sharps, F# C# G# E major has four sharps, F# C# G# D# B major has five sharps, F# C# G# D# A# F# major has six sharps, F# C# G# D# A# E# C# major has seven sharps, F# C# G# D# A# E# B#

Flat keys, the number and order of flats

F major has one flat, Bb
Bb major has two flats, Bb Eb
Eb major has three flats, Bb Eb Ab
Ab major has four flats, Bb Eb Ab Db
Db major has five flats, Bb Eb Ab Db Gb
Gb major has six flats, Bb Eb Ab Db Gb Cb
Cb major has seven flats, Bb Eb Ab Db Gb Cb Fb

sharps: F# C# G# D# A# E# B#.

Flats: Bb Eb Ab Db Gb Cb Fb

Fuente:http://music.tutsplus.com/tutorials/understanding-harmony-part-1--audio-23066

Fuente:http://www.piano-keyboard-guide.com/key-signatures.html