Which pop duo did George Michael have his breakthrough with?

Explanation

George Michael (b. 1963) is a Britsh singer-songwriter, born Georgios Kyriacos Panayiotou. In 1981, he formed the duo Wham! with class mate Andrew Ridgeley. They had hit songs such as Wake Me Up Before You Go GO, Freedom and I'm Your Man. In 1987, he released his first solo album, "Faith".