"Chemistry" takes influences from a wide variety of sources, including "everything from French chanson to piano-pounding blues to the clipped R&B of the Small Faces". Rapping in the same vein as artists like Betty Boo and Neneh Cherry is prominent. Yahoo! Music says "there's nary a 'formula' in sight. There are as many sudden tonal and tempo switches as the tricksiest Chicago art rock band. And all but one song here gives guitars a starring role." The songs are noticeably less rooted in electronic music, although "Swinging London Town" is "a dark, squiggly synth pop epic a la Pet Shop Boys" and "It's Magic" is composed of "little Royksopp-like keyboard riffs". Alternatively, "Tangled Up" features a dancier, more electronic sound, inspired by the success of their 2006 single "Something Kinda Ooooh". "Call the Shots", "Close to Love", and "Girl Overboard" are all electropop numbers reminiscent of 1980s music. However, "Control of the Knife" is more inspired by reggae and ska, while "Black Jacks" recalls "sixties psychedelica". "Out of Control" features a number of songs inspired by 1980s electropop, while also exploring retro styles. "The Promise" is a 1960s Spector-influenced number, while "Rolling Back the Rivers in Time" was compared to the works of Burt Bacharach.