As seen up there in the masthead, the cityofsound house typeface is Gotham, by Tobias Frere-Jones. It's a lovely thing: elegant, practical, versatile, modern. And the face has just been extended with the addition of Gotham Rounded.
"Our Gotham typeface, inspired by signs on buildings, celebrates the workmanlike "draftsman's alphabet" at a monumental scale. Similarly unadorned, but at a more intimate size, is the lettering of engineering: the marks on precision instruments, blueprints, stencils and templates. Drawn, stamped, engraved and routed, these forms are sensitively captured by our new Gotham Rounded family, available in four weights (with italics!) that go from friendly to high-tech to cheeky with ease."
"Gotham Rounded's expressive set of styles gives rise to a range of different tones. Set tightly in upper- and lowercase, the heavier weights are youthful and cheeky; these same fonts, composed as letterspaced caps, have a mechanical, even austere quality. Specific combinations of weight and spacing can even conjure the specific artifacts that inspired Gotham Rounded: letterspaced medium capitals evoke the markings on camera lenses, the light italic recalls the alphabets used on lettering templates, and the bold caps can pass for the routed wooden signs that identify hiking trails and picnic grounds."