Q: Passage: The first-generation Ford Mustang was manufactured by Ford from March 1964 until 1973. The introduction of the Mustang created a new class of automobile known as the pony car. The Mustang's styling, with its long hood and short deck, proved wildly popular and inspired a host of competition.

Question: Based on this passage, when did the first ford mustang came out? Let's give stream of consciousness first:
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The relevant information is: The first-generation Ford Mustang was manufactured by Ford from March 1964 until 1973. Therefore, the final answer is March 1964.
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