Thursday Morning Riddle

I’m the instrument favored by Little Boy Blue;
I’m the honk of the car; help you put on your shoe;
I am found on the head of a bull or gnu,
Or perhaps on your own, if your lady’s not true!

Who am I?

UPDATE: Riddle solved by Asher. See comments for answer.

2 Responses to “Thursday Morning Riddle”

  1. Asher Says:

    Horn

  2. Bill Says:

    HORN is correct. Way to go, Asher!

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