Three sharps mean the piece is played in the key of A. If one sharp is in front of Middle C, you play C sharp. If two sharps are in front of Middle C, you play D. If three sharps are in front of Middle C, you play D sharp.
I don't know about the "in a row" part. Three sharps is the key signature for A major. Or, it's relative minor, F# minor.
A sharp key signature is one that contains sharps.
There are no sharps in the key signature, but in the harmonic minor there is a G#.
There's no sharps of flats in the key signature in either C major or A minor.
What is a key signature? A key signature is the number of sharps or flats in a piece of music. For example C Major has no sharps G Major has 1 Sharp F Major has 1 Flat B flat
The key signature with three sharps is A major.
The key of C major has the most sharps in its key signature, with seven sharps.
The key signature with 3 sharps is A major.
The key with 5 sharps in its key signature is the key of B major.
The key with five sharps in its key signature is the key of B major.
The key signature with 5 sharps is D major.
A Major. F#, C# and G#.
The major key with 5 sharps in its key signature is B major.
The major key with 5 sharps in its key signature is B major.
The key signature with 5 sharps in music is the key of B major.
The key signature that contains 5 sharps is the key of B major.
The key signature that contains 7 sharps is the key of C major.