From a release:
SAN ANTONIO AND MOUNTAIN VIEW, Calif., April 16, 2007 — Clear Channel
Radio and Google Inc. (NASDAQ: GOOG), today announced a multi-year
agreement that enables Google to sell a guaranteed portion of 30-
second advertising inventory available on more than 675 of Clear
Channel’s AM/FM stations. Specific financial terms are not being
disclosed.
Under the agreement, Google™ Audio Ads advertisers will have national
distribution, enabling them to reach specific audiences, at specific
times, in targeted geographies. For Clear Channel, this agreement
opens up an additional sales channel and provides supplemental revenue
by making Clear Channel inventory available to advertisers who
previously had not used radio.