What does E+ mean? I am playing Some Enchanted Evening and this is added along with a C note.
+ signifies that the 5th is "augmented" or raised a half step. So "E+" indicates an E augmented triad.
An E (major) triad is:
note | E | G# | B
degree | 1 | 3 | 5
But an E augmented triad has a raised 5th:
note | E | G# | B#
degree | 1 | 3 | #5
It's simply they symbol for an augmented chord which contains a root, Major 3rd, and an Augmented 5th. The note would not be a C, but a B♯ since the 5th of an E chord is some type of B rather than some type of C.
Here's what it would look like in closed position:
X:1 L:1/1 M: K:E V:1 clef=treble "E+"[E G ^B] | %