Yep, apparently real…
https://books.google.com/books?id=OwgrKZQeCncC&pg=PA187&dq="louis+armstrong"+"give+peace+a+chance"&hl=en&sa=X&ved=0ahUKEwiZ3af76e3QAhUhrlQKHehwBEIQ6AEIIzAB#v=onepage&q="louis%20armstrong"%20"give%20peace%20a%20chance"&f=false
