How did musical styles evolve after the death of Bach, and what is the definition of "contrapuntal style"?

Chapter I, In the Beginning notes an era after Bach's death in 1750 when the contrapuntal style with its several simultaneous melodies that he fostered evolved into the homophonic or single melody style. The new style was a singing, nuanced, fluffy, polite and melodic sonata rather than the heavy, tempestuous fugues played on church organs.