piano chord
Bmaj7
B1D♯3F♯5A♯7
Major triad with a major seventh: a half step below the root, an octave up.
What is true of it
Bmaj7 is B, D♯, F♯ and A♯ — 1, 3, 5 and 7 counted from B.
On an instrument that cannot reach all 4, the 5 goes first, in that order.