The Byrds' third album, "Fifth Dimension", was released in July 1966. Much of the album's material continued to build on the band's new psychedelic sound, with McGuinn extending his exploration of jazz and raga styles on tracks such as "I See You" and the Crosby-penned "What's Happening?!?!". The album also saw Hillman coming forward as the band's third vocalist, in order to fill the hole in the group's harmonies that Clark's departure had left. The title track, "5D (Fifth Dimension)", was released as a single ahead of the album and was, like "Eight Miles High" before it, banned by a number of U.S. radio stations for supposedly featuring lyrics that advocated drug use. In addition, the album's front cover artwork featured the first appearance of the Byrds' colorful, psychedelic mosaic logo, variations of which would subsequently appear on a number of the band's compilation albums, as well as on their 1967 release, "Younger Than Yesterday".