Who is Charles Wesley? You may know him as the younger brother of founder of the Methodist Church (though some, including the author consider the brothers co-founders, while I've read one person that said George Whitefield was the founder but left the movement to the Wesleys to keep from dividing the movement). You may be a little more familiar with Charles than you think, though: he wrote thousand of hymns including "O For A Thousand Tongues To Sing" (where the author took his title from), "Hark! The Herald Angels Sing!", "Come Thou Long Expected Jesus," and "And Can It Be That I Should Gain."
There are some biographies that seem a little deep and that I need to work through. This one is an example. It is basically chronological,but the chapters deal with various topics, such as the controversy with Calvinism, Wesley's marriage and family, the persecution endured by the Church of England and how the brothers disagreed about remaining a part of the Church of England.