A# add13/F
The A# add13 chord consists of the A# (Perfect unison), D (Major third), F (Perfect fifth) and G (Major thirteenth) notes, with F as the bass note.

How to play the A# add13/F chord
- Play F as the lowest bass note in the left hand
- Find A# (Root) on the piano keyboard
- Add D (Major third) — 4 semitones above A#
- Add F (Perfect fifth) — 7 semitones above A#
- Add G (Major thirteenth) — 21 semitones above A#
- Press all 5 notes simultaneously to sound the A# add13/F chord