E m6/C#
The E m6 chord consists of the E (Perfect unison), G (Minor third), B (Perfect fifth) and C# (Major sixth) notes, with C# as the bass note.

How to play the E m6/C# chord
- Play C# as the lowest bass note in the left hand
- Find E (Root) on the piano keyboard
- Add G (Minor third) — 3 semitones above E
- Add B (Perfect fifth) — 7 semitones above E
- Add C# (Major sixth) — 9 semitones above E
- Press all 5 notes simultaneously to sound the E m6/C# chord