by Stephen Thomas Erlewine 　　  　　Behavior was a retreat from the deep dance textures of Introspective, as it picked up on the carefully constructed pop of Actually. In fact, Behavior functions as the Pet Shop Boys' bid for mainstream credibility, as much of the album relies more on popcraft than rhythmic variations. Although its a subtle maneuver, it would have been rather disastrous if the results weren't so captivating. Tennant takes this approach seriously, singing the lyrics instead of speaking them. That doesn't necessarily give the album added emotional baggage -- all of the distance and detachment in the duo's music is not a hindrance, it's part of the concept -- but it does result in an ambitious and breathtaking pop album, which manages to include everything from the spiteful "How Can You Expect to Be Taken Seriously?" to the wistful "Being Boring."