Mrs. Don-o:
Not Methodist here, but I seem to remember that both of the Wesley Brothers were Anglicans who launched reform movements within the Anglican Tradition, neither of them I think ever left the church of England, but after they passed on, some of their followers broke away and Methodism became a separate community apart from Anglicanism.
Former Episcopagan here who fled TEC in 2003 after 48 years. CTrent1564 is correct regarding the history of the Wesley brothers.
I like the Methodist hymns from the 1866 edition of Christian Harmony, which is what our shape note group sings from. The Wesleys were clearly very gifted men.