Notes to Macbeth, Act 4, Scene 1, line 39:

"Black spirits, etc."


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Macbeth,
Act 4, Scene 1, line 39.
It is generally thought that the song referred to by its first line, "Black spirits," is the same song used later in The Witch (c. 1615), a play by Thomas Middleton (1580-1627). The play is online: See The Witch, by Thomas Middleton.

Below are the lyrics. As you can see, in The Witch, there's not only a song, but a dance, with mingling and bobbing and dancing round about.
A charm song about a vessel: i.e., a song to accompany the casting of a charm, to be sung by witches assembled around a cauldron.
A charm song about a vessel.

HECATE:
Black spirits and white, red spirits and grey,
Mingle, mingle, mingle, you that mingle may.
Titty, Tiffin, keep it stiff in.
Firedrake, Puckey, make it lucky.
Liard, Robin, you must bob in.
Round, around, around, about, about,
All ill come running in, all good keep out.

FIRST WITCH:
Here's the blood of a bat.

HECATE:
Put in that, oh, put in that.

SECOND WITCH:
libbard's bane: leopard's bane. It's a poisonous herb.
Here's libbard's bane.

HECATE:
Put in again.

FIRST WITCH:
The juice of toad, the oil of adder.

SECOND WITCH:
the younker: the pretty young gentleman.
Those will make the younker madder.

HECATE:
Put in; there's all, and rid the stench.

FIRESTONE:
Nay, here's three ounces of the red-hair'd wench.

ALL:
Round, around, around, about, about,
All ill come running in, all good keep out.