E/C♯
E Major over C♯ · 3 fingerings
A slash chord: a E major triad with C♯ in the bass instead of the root. The chord above stays the same — only the lowest note changes — which lets E/C♯ walk the bass by step through a progression while the harmony holds. A simple trick that makes ordinary chord sequences sound considerably more composed.
E/C♯ · position 1 · fret 4
E/C♯ · position 2 · fret 4
E/C♯ · position 3 · fret 9