Bb 6/F#
The Bb 6 chord consists of the Bb (Perfect unison), D (Major third), F (Perfect fifth) and G (Major sixth) notes, with F# as the bass note.

How to play the Bb 6/F# chord
- Play F# as the lowest bass note in the left hand
- Find Bb (Root) on the piano keyboard
- Add D (Major third) — 4 semitones above Bb
- Add F (Perfect fifth) — 7 semitones above Bb
- Add G (Major sixth) — 9 semitones above Bb
- Press all 5 notes simultaneously to sound the Bb 6/F# chord