I was thinking of those fantastic concert posters of the 60s from the Fillmore when I worked on this logo. I used the beautiful Moderne Gothics typefaces by Jim Parkinson. This logo (and the others for the iheartradio app) needed to fit in a 1 x 1 inch format. The client was Clear Channel Communications.
Herb Lubalin and Tom Carnase created the Avant Garde typeface in 1968. It was widely used in the 70s, very much so in the music industry. I used it here for a 70s-80s feel.