Continuum is about as apt a title as it gets for John Mayer's third studio disc. Every element, from the peerless guitar playing to the plainspoken poetry of the lyrics to the breathy-sincere singing, makes a return from previous efforts. But to weakly pronounce this another worthwhile effort from an artist the world has come to expect a whole lot from and then call it a day would be no minor misdeed, because it's also the best, boldest disc he's ever made. Taking maturity as a theme throughout, Mayer tackles a batch of adulthood's bogeymen: indifference on the uptempo chart-climber ...