Palo Alto, Calif.--Crescendo Ventures, a venture capital firm with more than $1 billion under management, has retained San Francisco-based Bravo! Marketing as its ad agency of record. Bravo! will develop an integrated advertising and public relations campaign for Crescendo. Venture capital firm ad campaigns are rare, but increasing competition in the space is leading firms to take more steps to stand out. A budget for the campaign was not disclosed.