Right hand: index finger (2) on F♯, middle finger (3) on A♯, ring finger (4) on B, little finger (5) on C♯.
Left hand: little finger (5) on F♯, ring finger (4) on A♯, middle finger (3) on B, index finger (2) on C♯.
Key Signature
A chord has no key signature of its own, but the F♯ Add 4 is the tonic (I) chord of F♯ Major, whose key signature has 6 sharps (F♯, C♯, G♯, D♯, A♯, E♯).
F♯C♯G♯D♯A♯E♯
Order of sharps
Sharps are added to a key signature in a fixed order. Each new sharp key adds the next sharp on the list.
F♯C♯G♯D♯A♯E♯B♯
Mnemonic:Father Charles Goes Down And Ends Battle
Chords in the Key of F♯ Major
These are the triads built on each degree of F♯ Major: